Blender Git Loki

deps/windows: Fix wrong crt for libjpeg and pthreads

The msvc linker had been warning about libcmt being dragged
in for a bit, finally tracked the issue down to the deps of
jpeg and pthreads which both ignored our cflags.

this diff changes them both to use the dynamic crt rather
than the static one so they'll be in line with all our
other libraries.