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/
/**
* @file gtkwin32dep.h UI Win32 Specific Functionality
* @ingroup win32
*
* Pidgin is the legal property of its developers, whose names are too numerous
* to list here. Please refer to the COPYRIGHT file distributed with this
* source distribution
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*/
#ifndef _GTKWIN32DEP_H_
#define _GTKWIN32DEP_H_
#include <windows.h>
#include <gtk/gtk.h>
#include "conversation.h"
HINSTANCE winpidgin_dll_hinstance(void);
HINSTANCE winpidgin_exe_hinstance(void);
/* Utility */
int winpidgin_gz_decompress(const char* in, const char* out);
int winpidgin_gz_untar(const char* filename, const char* destdir);
/* Misc */
void winpidgin_notify_uri(const char *uri);
void winpidgin_shell_execute(const char *target, const char *verb, const char *clazz);
void winpidgin_ensure_onscreen(GtkWidget *win);
void winpidgin_conv_blink(PurpleConversation *conv, PurpleMessageFlags flags);
void winpidgin_window_flash(GtkWindow *window, gboolean flash);
DWORD winpidgin_get_lastactive(void);
/* init / cleanup */
void winpidgin_init(HINSTANCE);
void winpidgin_post_init(void);
void winpidgin_cleanup(void);
#endif /* _GTKWIN32DEP_H_ */