Fix compiler_version.py on systems with non-English locale.

build/compiler_version.py

Index: build/compiler_version.py
diff --git a/build/compiler_version.py b/build/compiler_version.py
index b06712d25b2d3c25990a97f99a630a66c703ce0b..fd23d89bd63b21c2304b80e22c12df7450120b42 100755
--- a/build/compiler_version.py
+++ b/build/compiler_version.py
@@ -60,6 +60,10 @@ def GetVersion(compiler, tool):
 
 
 def main(args):
+  # Force the locale to C otherwise the version string could be localized
+  # making regex matching fail.
+  os.environ["LC_ALL"] = "C"
+
   tool = "compiler"
   if len(args) == 1:
     tool = args[0]