Autotools: Remove unused variable FREETYPE2_FOUND

Follow-up of 19d8a6b.

Author: petk

ext/gd/config.m4

@@ -115,7 +115,7 @@ AC_DEFUN([PHP_GD_XPM],[
 
 AC_DEFUN([PHP_GD_FREETYPE2],[
   if test "$PHP_FREETYPE" != "no"; then
-    PKG_CHECK_MODULES([FREETYPE2], [freetype2], [FREETYPE2_FOUND=true])
+    PKG_CHECK_MODULES([FREETYPE2], [freetype2])
 
     PHP_EVAL_INCLINE([$FREETYPE2_CFLAGS])
     PHP_EVAL_LIBLINE([$FREETYPE2_LIBS], [GD_SHARED_LIBADD])