GN: match shell behavior for cc and cxx in is_clang.py
Interprets cc/cxx as part of the shell command rather than literal
arguments. This matches the behavior of shell invocations from ninja.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2375573002
Review-Url: https://codereview.chromium.org/2375573002
diff --git a/gn/is_clang.py b/gn/is_clang.py
index 99173a0..a63111c 100755
--- a/gn/is_clang.py
+++ b/gn/is_clang.py
@@ -9,8 +9,8 @@
import sys
cc,cxx = sys.argv[1:3]
-if ('clang' in subprocess.check_output([cc, '--version']) and
- 'clang' in subprocess.check_output([cxx, '--version'])):
+if ('clang' in subprocess.check_output('%s --version' % cc, shell=True) and
+ 'clang' in subprocess.check_output('%s --version' % cxx, shell=True)):
print 'true'
else:
print 'false'