This patch adds 'opengl' as a fallback to 'GL' for dependency lookup, to
link with libglvnd configured without X11 support.
For OpenGL, libglvnd provides two pkg-config files: `gl.pc' with GLX
support while `opengl.pc' not. When building without X11 support, the
former won't be installed.
prevents build-failure when xwayland is disabled to to
add_project_arguments('-DNO_XWAYLAND', language: 'cpp')
beeing called after the required wayland protocols have been built.
this makes for a far better experience in combination with wlroots,
since that whole makefile mess is not required.
Additionaly, handling of wayland protocol sources is also slightly
better, but could be improved with mesons inbuilt wayland module.
To build Hyprland using meson:
meson _build -Ddefault_library=static
ninja -C _build
ninja -C _build install
