gyp: fix regex to match multi-digit versions

This fixes the regular expression matching in `xcode_emulation`
to also handle version numbers with multiple-digit major versions
which would otherwise break under use of XCode 10

Fixes: #1454
PR-URL: #1455
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

gyp/pylib/gyp/xcode_emulation.py

@@ -1262,7 +1262,7 @@ def XcodeVersion():
   except:
     version = CLTVersion()
     if version:
-      version = re.match(r'(\d\.\d\.?\d*)', version).groups()[0]
+      version = re.match(r'(\d+\.\d+\.?\d*)', version).groups()[0]
     else:
       raise GypError("No Xcode or CLT version detected!")
     # The CLT has no build information, so we return an empty string.