treat all whitespace as a delimiter in GYP_DEFINES

gyp itself treats any whitespace as a delimiter in GYP_DEFINES, this script should behave the same.

NOTRY=true

Review URL: https://codereview.chromium.org/290173005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271851 0039d316-1c4b-4281-b951-d872f2087c98

third_party/binutils/download.py

@@ -40,7 +40,7 @@ def WriteFile(filename, content):
 
 def GetArch():
   gyp_host_arch = re.search(
-      'host_arch=([^ ]*)', os.environ.get('GYP_DEFINES', ''))
+      'host_arch=(\S*)', os.environ.get('GYP_DEFINES', ''))
   if gyp_host_arch:
     arch = gyp_host_arch.group(1)
     # This matches detect_host_arch.py.