signal_connect: Simplify ambiguity removal when compiling with MSVC #5

	# 2024-07-19: ubuntu-latest = ubuntu-22.04
	# See https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories
	name: "Meson: gcc"

	on: [push]

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v1
	- name: Build
	run: \|
	# Prevent blocking apt install on a question during configuring of tzdata.
	export ENV DEBIAN_FRONTEND=noninteractive
	sudo apt update
	sudo apt install libxml2-utils docbook5-xml docbook-xsl mm-common g++ ninja-build python3-setuptools python3-pip --yes
	# Ubuntu 22.04 contains meson 0.61.2, but libsigc++ requires meson >= 0.62.0.
	# Install it with pip instead of apt.
	sudo pip install "meson>=0.62.0"
	export CXX=g++
	meson setup -Dwarnings=fatal -Dwarning_level=3 -Dwerror=true _build
	cd _build
	meson compile
	- name: Test
	run: \|
	cd _build
	meson test
	- name: Dist
	run: \|
	sudo apt install git --yes
	# dist runs setup again so we need to specify CXX again.
	export CXX=g++
	cd _build
	meson dist

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