PEXHACK: remove "/utf-8" from MSVC builds
PEXHACK: remove "/utf-8" from MSVC builds

This messes up the intel compiler, making it error out on things like
the configure steps checking for headers.

pexip/meson,pexip/meson,pexip/meson,pexip/meson,pexip/meson,pexip/meson,pexip/meson,pexip/meson,pexip/meson,pexip/meson