Msys2 Makefile: Rename Qt targets specifically Qt5 ones
Change Msys2 Makefile Qt targets specifically to Qt5 targets to arrange namespace so that we can have both Qt5 and Qt6 builds in the future.
- New patches with 'make clean' fixed
Change Msys2 Makefile Qt targets specifically to Qt5 targets to arrange namespace so that we can have both Qt5 and Qt6 builds in the future.