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/
# vi:et:ts=2 sw=2 sts=2
image: pidgin/builder-debian:buster
pipelines:
default:
- step:
script:
- set -ex
- meson -Dsilc=false -Ddoc=true -Ddebug=true build
- ninja -C build
- ninja -C build test
branches:
release-2.x.y:
- step:
image: pidgin/builders-2:debian-buster-amd64
script:
- set -ex
- hg clone https://bitbucket.org/pidgin/libgnt -b release-2.x.y
- meson -Dprefix=/usr libgnt libgnt/build
- ninja -C libgnt/build install
- ldconfig
- build.sh