We really shouldn't override what the user has set externally. While it's true
that `-Wall` is set in `DEBUG_CFLAGS` later, dropping it from `CFLAGS` breaks
Perl detection somehow. Instead of going through the work to figure out how to
fix that, just stop modifying `CFLAGS` from the beginning.
Testing Done:
Compiled on Rawhide with the attached patch.
Bugs closed: PIDGIN-16593
Reviewed at https://reviews.imfreedom.org/r/2946/
# Makefile.mingw
#
# Description: Makefile to generate mo files
#
PIDGIN_TREE_TOP:=..
include $(PIDGIN_TREE_TOP)/libpurple/win32/global.mak