Not all developers have =~ support in bash, apparently.
Switching to standard globbing.

R=tapted
TBR=maruel

Review URL: https://codereview.chromium.org/11369147

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@166867 0039d316-1c4b-4281-b951-d872f2087c98