pidgin/pidgin

Use LT_LIB_M to determine if we need to link to the math library and link Pidgin to the X11 libraries
release-2.x.y
2021-04-11, Gary Kramlich
132d17234930
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/
#include"glm.h"
#include <GL/gl.h>
#include <GL/glu.h>
void init_lists(GLint** lists, GLMmodel*** models, int num_lists, char* name, float my_scale);
int compute_lid(BOOL open, int curr_lid, int max);
void apply_output_mode(FACE f, GLfloat* angle, GLfloat* yangle, BOOL* left_open, BOOL* right_open, GLfloat* open, DIRECTION* dir);