gfxstream: guest: cpp_args --> guest_cpp_args

This is more descriptive..

BUG=311486792
TEST=compile

Change-Id: I29a38e5776e96fa8debdd365a2d5c5d2997033cf
diff --git a/guest/OpenglSystemCommon/meson.build b/guest/OpenglSystemCommon/meson.build
index 69de0b8..bf9d761 100644
--- a/guest/OpenglSystemCommon/meson.build
+++ b/guest/OpenglSystemCommon/meson.build
@@ -12,7 +12,7 @@
 lib_stream = static_library(
    'stream',
    files_lib_stream,
-   cpp_args: cpp_args,
+   cpp_args: gfxstream_guest_args,
    include_directories: [inc_vulkan_headers, inc_opengl_headers,
                          inc_guest_iostream, inc_opengl_codec,
                          inc_android_emu, inc_render_enc, inc_android_compat,