ci: Fix windows-msys build (by fixing libnereon build)

This commit re-uses build logic from libnereon's GHA scripts.

Related: #421

ci/before_install/msys.sh

@@ -3,13 +3,18 @@ set -ex
 
 msys_install() {
 	packages=(
+		autoconf
 		automake
-		mingw-w64-x86_64-cmocka
-		mingw64/mingw-w64-x86_64-ninja
-		mingw64/mingw-w64-x86_64-cmake
-		mingw64/mingw-w64-x86_64-graphviz # for doxygen's dot component
-		openssl-devel
+		cmake
+		cmocka
 		doxygen
+		gcc
+		git
+		graphviz # for doxygen's dot component
+		libtool
+		make
+		ninja
+		openssl-devel
 	)
 	pacman --noconfirm -S --needed "${packages[@]}"
 	gem install mustache

ci/install_functions.sh

@@ -47,10 +47,17 @@ install_libnereon() {
 	git clone -b "${LIBNEREON_VERSION}" https://github.com/riboseinc/libnereon
 	cd libnereon
 	mkdir build
-	cd build
-	cmake ..
-	ls -la
-	ls -la ..
-	make
-	sudo make install
+
+	if [[ "$(get_os)" = msys* ]]
+	then
+		cmake -S . -B build -G "Unix Makefiles"
+		cmake --build build
+		cmake --build build --target test
+		cmake --build build --target install
+	else
+		cd build
+		cmake ..
+		make
+		sudo make install
+	fi
 }