dependencies/qt: split get_qmake_host_bins into a free function
dependencies/qt: split get_qmake_host_bins into a free function

It's static anyway, and never overwritten.

mesonbuild/meson,mesonbuild/meson,pexip/meson,jpakkane/meson,jpakkane/meson,jpakkane/meson,jpakkane/meson,jpakkane/meson,mesonbuild/meson,mesonbuild/meson,QuLogic/meson,pexip/meson,QuLogic/meson,QuLogic/meson,mesonbuild/meson,QuLogic/meson,pexip/meson,jpakkane/meson,mesonbuild/meson,mesonbuild/meson,QuLogic/meson,jpakkane/meson,jpakkane/meson,QuLogic/meson,QuLogic/meson,pexip/meson,mesonbuild/meson,QuLogic/meson,pexip/meson,QuLogic/meson,pexip/meson,pexip/meson,pexip/meson,jpakkane/meson,pexip/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson