msvc: enable /std:c11 flag
msvc: enable /std:c11 flag

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