gcc-git: Fix missing "

mingw-w64-gcc-git/PKGBUILD

@@ -35,7 +35,7 @@ optdepends=()
 options=('staticlibs' '!emptydirs' '!strip' 'debug')
 _branch=gcc-5-branch
 #_branch=master
-if [ "${_branch} = "master" ]; then
+if [ "${_branch}" = "master" ]; then
   _realpkgver=6.0.0
 else
   _realpkgver=5.2.1