[py] minor, replace os.environ.get with os.getenv
diff --git a/src/check-c-linkage-decls.py b/src/check-c-linkage-decls.py
index 6ae2579..b7532a7 100755
--- a/src/check-c-linkage-decls.py
+++ b/src/check-c-linkage-decls.py
@@ -2,11 +2,11 @@
 
 import sys, os
 
-os.chdir (os.environ.get ('srcdir', os.path.dirname (__file__)))
+os.chdir (os.getenv ('srcdir', os.path.dirname (__file__)))
 
-HBHEADERS = [os.path.basename (x) for x in os.environ.get ('HBHEADERS', '').split ()] or \
+HBHEADERS = [os.path.basename (x) for x in os.getenv ('HBHEADERS', '').split ()] or \
 	[x for x in os.listdir ('.') if x.startswith ('hb') and x.endswith ('.h')]
-HBSOURCES = [os.path.basename (x) for x in os.environ.get ('HBSOURCES', '').split ()] or \
+HBSOURCES = [os.path.basename (x) for x in os.getenv ('HBSOURCES', '').split ()] or \
 	[x for x in os.listdir ('.') if x.startswith ('hb') and x.endswith (('.cc', '.hh'))]
 
 stat = 0
diff --git a/src/check-externs.py b/src/check-externs.py
index ea6d7f3..a64d2e5 100755
--- a/src/check-externs.py
+++ b/src/check-externs.py
@@ -2,9 +2,9 @@
 
 import sys, os, re
 
-os.chdir (os.environ.get ('srcdir', os.path.dirname (__file__)))
+os.chdir (os.getenv ('srcdir', os.path.dirname (__file__)))
 
-HBHEADERS = [os.path.basename (x) for x in os.environ.get ('HBHEADERS', '').split ()] or \
+HBHEADERS = [os.path.basename (x) for x in os.getenv ('HBHEADERS', '').split ()] or \
 	[x for x in os.listdir ('.') if x.startswith ('hb') and x.endswith ('.h')]
 
 stat = 0
diff --git a/src/check-header-guards.py b/src/check-header-guards.py
index 6bf6ad4..0ad42cd 100755
--- a/src/check-header-guards.py
+++ b/src/check-header-guards.py
@@ -2,11 +2,11 @@
 
 import sys, os, re
 
-os.chdir (os.environ.get ('srcdir', os.path.dirname (__file__)))
+os.chdir (os.getenv ('srcdir', os.path.dirname (__file__)))
 
-HBHEADERS = [os.path.basename (x) for x in os.environ.get ('HBHEADERS', '').split ()] or \
+HBHEADERS = [os.path.basename (x) for x in os.getenv ('HBHEADERS', '').split ()] or \
 	[x for x in os.listdir ('.') if x.startswith ('hb') and x.endswith ('.h')]
-HBSOURCES = [os.path.basename (x) for x in os.environ.get ('HBSOURCES', '').split ()] or \
+HBSOURCES = [os.path.basename (x) for x in os.getenv ('HBSOURCES', '').split ()] or \
 	[x for x in os.listdir ('.') if x.startswith ('hb') and x.endswith (('.cc', '.hh'))]
 
 stat = 0
diff --git a/src/check-includes.py b/src/check-includes.py
index d9219bf..88eaa2e 100755
--- a/src/check-includes.py
+++ b/src/check-includes.py
@@ -2,11 +2,11 @@
 
 import sys, os, re
 
-os.chdir (os.environ.get ('srcdir', os.path.dirname (__file__)))
+os.chdir (os.getenv ('srcdir', os.path.dirname (__file__)))
 
-HBHEADERS = [os.path.basename (x) for x in os.environ.get ('HBHEADERS', '').split ()] or \
+HBHEADERS = [os.path.basename (x) for x in os.getenv ('HBHEADERS', '').split ()] or \
 	[x for x in os.listdir ('.') if x.startswith ('hb') and x.endswith ('.h')]
-HBSOURCES = [os.path.basename (x) for x in os.environ.get ('HBSOURCES', '').split ()] or \
+HBSOURCES = [os.path.basename (x) for x in os.getenv ('HBSOURCES', '').split ()] or \
 	[x for x in os.listdir ('.') if x.startswith ('hb') and x.endswith (('.cc', '.hh'))]
 
 stat = 0
diff --git a/src/check-libstdc++.py b/src/check-libstdc++.py
index 142785c..200c683 100755
--- a/src/check-libstdc++.py
+++ b/src/check-libstdc++.py
@@ -2,9 +2,9 @@
 
 import sys, os, shutil, subprocess
 
-os.chdir (os.environ.get ('srcdir', os.path.dirname (__file__)))
+os.chdir (os.getenv ('srcdir', os.path.dirname (__file__)))
 
-libs = os.environ.get ('libs', '.libs')
+libs = os.getenv ('libs', '.libs')
 
 ldd = shutil.which ('ldd')
 if ldd:
diff --git a/src/check-static-inits.py b/src/check-static-inits.py
index 9e43b81..1c88f22 100755
--- a/src/check-static-inits.py
+++ b/src/check-static-inits.py
@@ -2,8 +2,8 @@
 
 import sys, os, shutil, subprocess, glob, re
 
-builddir = os.environ.get ('builddir', os.path.dirname (__file__))
-libs = os.environ.get ('libs', '.libs')
+builddir = os.getenv ('builddir', os.path.dirname (__file__))
+libs = os.getenv ('libs', '.libs')
 
 objdump = shutil.which ('objdump')
 if not objdump:
diff --git a/src/check-symbols.py b/src/check-symbols.py
index 92f44cd..d36b6c4 100755
--- a/src/check-symbols.py
+++ b/src/check-symbols.py
@@ -4,8 +4,8 @@
 
 os.environ['LC_ALL'] = 'C' # otherwise 'nm' prints in wrong order
 
-builddir = os.environ.get ('builddir', os.path.dirname (__file__))
-libs = os.environ.get ('libs', '.libs')
+builddir = os.getenv ('builddir', os.path.dirname (__file__))
+libs = os.getenv ('libs', '.libs')
 
 IGNORED_SYMBOLS = '|'.join(['_fini', '_init', '_fdata', '_ftext', '_fbss',
 	'__bss_start', '__bss_start__', '__bss_end__', '_edata', '_end', '_bss_end__',
diff --git a/src/gen-def.py b/src/gen-def.py
index 822a944..aa6dcd9 100755
--- a/src/gen-def.py
+++ b/src/gen-def.py
@@ -41,7 +41,7 @@
 	symbols = [x for x in symbols if x not in experimental_symbols]
 symbols = "\n".join (symbols)
 
-result = symbols if os.environ.get('PLAIN_LIST', '') else """EXPORTS
+result = symbols if os.getenv ('PLAIN_LIST', '') else """EXPORTS
 %s
 LIBRARY lib%s-0.dll""" % (symbols, output_file.replace ('src/', '').replace ('.def', ''))