pidgin/pidgin

Use LT_LIB_M to determine if we need to link to the math library and link Pidgin to the X11 libraries

Gentoo ran into an issue with the gold linker without -lm. The original patch
and work came from Justin Lechner. https://bugs.gentoo.org/386079

Gentoo also ran into an issue with X11_LIBS not being added to pidgin. This
should already be implicit everywhere except for homebrew which patches X11
out of their build. Original patch/work came from and. https://bugs.gentoo.org/500762

Testing Done:
Installed and ran locally.

Reviewed at https://reviews.imfreedom.org/r/608/
#
# Makefile.mingw
#
# Description: Makefile for win32 (mingw) version of Pidgin ca-certs
#
PIDGIN_TREE_TOP := ../..
include $(PIDGIN_TREE_TOP)/libpurple/win32/global.mak
datadir := $(PIDGIN_INSTALL_DIR)
-include ./Makefile.am.mingw
cacertsdir := $(PIDGIN_INSTALL_DIR)/ca-certs
.PHONY: install clean
install: ./Makefile.am.mingw
if test '$(cacerts_DATA)'; then \
mkdir -p $(cacertsdir); \
cp $(cacerts_DATA) $(cacertsdir); \
fi;
clean:
rm -f ./Makefile.am.mingw
./Makefile.am.mingw: ./Makefile.am
sed -e 's/^if\ INSTALL_SSL_CERTIFICATES/ifeq (\$$(INSTALL_SSL_CERTIFICATES), 1)/' ./Makefile.am > $@