merge_libs.py: fixes Windows breakage: there should be no space after "lib /OUT:".

TBR=andrew@webrtc.org
BUG=b/15773179

Review URL: https://webrtc-codereview.appspot.com/16999004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6793 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/build/merge_libs.py

@@ -78,7 +78,7 @@ def main(argv):
                     ' -and -not -name '.join(IGNORE_PATTERNS) +
                     ' -exec', cmd, output_lib, '{} +'])
   else:
-    cmd = ' '.join([cmd, output_lib] + FindFiles(search_path, pattern))
+    cmd = ' '.join([cmd + output_lib] + FindFiles(search_path, pattern))
   print cmd
   subprocess.check_call(cmd, shell=True)
   return 0