gearman-php: fix for non-/usr/local installs
gearman-php: fix for non-/usr/local installs

Closes #10012.

Signed-off-by: Jack Nagel <43386ce32af96f5c56f2a88e458cb94cebee3751@gmail.com>

TomK/homebrew-php,mkalkbrenner/homebrew-php,dguyon/homebrew-php,ablyler/homebrew-php,philcook/homebrew-php