Update linux-x86 Go prebuilts from ab/7362735

https://ci.android.com/builds/branches/aosp-build-tools-release/grid?head=7362735&tail=7362735

Update script: toolchain/go/update-prebuilts.sh

Test: Treehugger presubmit
Change-Id: I94be24fb6cf1b227ba5ff0faed2605310b5c167f
diff --git a/src/run.rc b/src/run.rc
index ab7abfa..a7b4801 100755
--- a/src/run.rc
+++ b/src/run.rc
@@ -12,10 +12,9 @@
 
 eval `{../bin/go env}
 
-GOPATH = () # we disallow local import for non-local packages, if $GOROOT happens
-            # to be under $GOPATH, then some tests below will fail
-GOBIN = () # Issue 14340
-GOFLAGS = ()
-GO111MODULE = ()
+GOPATH=/nonexist-gopath
+GOBIN=() # Issue 14340
+GOFLAGS=()
+GO111MODULE=()
 
 exec ../bin/go tool dist test -rebuild $*