Improve Makefile to match the spec of Hyprland Makefile, and improve installing steps by creating directories beforehand

[Frontear]

EDIT: Converted to draft because there are a lot of missing steps compared to Meson, such as described in #95

TODO:

• ${PREFIX}/share/pkgconfig/hyprland-protocols.pc
• ${PREFIX}/share/hyprland-protocols/protocols/hyprland-global-shortcuts-v1.xml
• ${PREFIX}/share/hyprland-protocols/protocols/hyprland-toplevel-export-v1.xml

Why?

My original goal for this MR was not to actually match Hyprland's Makefile, that was more of a "eh, why not" decision. My main goal was to add some mkdir -p to the installation task so that copying the various build artifacts would succeed in cases of package managers.

I've created and maintain a separate PKGBUILD for Arch Linux that builds this portal, and time and time again I've been forced to use the meson because the current Makefile does not create the directories but rather assumes they exist. Obviously this isn't a fault of the Makefile, since in a reasonable system with all the correct dependencies these files would already exist, but it leaves problems for when I need to create the file system hierarchy in an isolated packaging environment.

What's changed?

• Removed LIBEXEC and SHARE and replaced them with ${PREFIX}/lib and ${PREFIX}/share (if this breaks intended behavior, I will revert this change)
• Add a EUID check for make all, similar to Hyprland's Makefile
• Add test -f check in make install, similar to Hyprland's Makefile
• Add mkdir -p for the various directories used for installing the build artifacts
• NEW: Noticed nproc was not correctly being parsed and changed to correctly parse it for parallel jobs
• NEW: Fixed a missing .service extension when copying ./org.freedesktop.impl.portal.desktop.hyprland.service.in

Ready to merge?

Not yet

[Frontear]

Closing because of a lack of time