Simplify `gcc_version' check.

gcc_version is always defined after r196910 (to 0 by default, and a
meaningful value when GCC is used in the appropriate platforms), so we
can back out r196565 and use a simpler check.

R=thakis@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/14449007

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/hunspell@197309 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed