Improve regular expression for MSVC compiler target arch detection
Improve regular expression for MSVC compiler target arch detection

Did not work for some MSVC output language combinations.
Now should work for every locale / output language.

Fixes issue #6757

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