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/
/*
* Header file for common error description library.
*
* Copyright 1988, Student Information Processing Board of the
* Massachusetts Institute of Technology.
*
* For copyright and distribution info, see the documentation supplied
* with this package.
*/
#ifndef __COM_ERR_H
#define __COM_ERR_H
#define COM_ERR_BUF_LEN 25
/* Use __STDC__ to guess whether we can use stdarg, prototypes, and const.
* This is a public header file, so autoconf can't help us here. */
#ifdef __STDC__
# include <stdarg.h>
# define ETP(x) x
# define ETCONST const
#else
# define ETP(x) ()
# define ETCONST
#endif
typedef void (*error_handler_t) ETP((ETCONST char *, long, ETCONST char *,
va_list));
extern error_handler_t com_err_hook;
void com_err ETP((ETCONST char *, long, ETCONST char *, ...));
ETCONST char *error_message ETP((long));
ETCONST char *error_message_r ETP((long, char *));
error_handler_t set_com_err_hook ETP((error_handler_t));
error_handler_t reset_com_err_hook ETP((void));
#undef ETP
#endif /* ! defined(__COM_ERR_H) */