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/
environment:
- REPO=pidgin/pidgin2-docs
- TAG=latest
- REGISTRY=docker.io
- REGISTRY_USERNAME
- REGISTRY_PASSWORD
tasks:
import:
type: docker/import
files: .:.
build:
type: docker/build
dockerfile: Dockerfile.doxygen
tag: ${REGISTRY}/${REPO}:${TAG}
files: .:.
login:
type: docker/login
username: ${REGISTRY_USERNAME}
password: ${REGISTRY_PASSWORD}
server: ${REGISTRY}
logout:
type: docker/logout
server: ${REGISTRY}
push:
type: docker/push
images: ${REGISTRY}/${REPO}:${TAG}
plans:
default:
stages:
- tasks: [import, build]
ci:
stages:
- tasks: [import, build, login, push]
- tasks: [logout]
run: always