reapply 3e82833: "win: fix unresolved sym _va_copy. DNE for msvc"
reapply 59fd0b2: "win: gst-plugins-base - don't use GST_CAT_PERFORMANCE"

it leads to unresolved symbols when linking
reapply b0574c7: "win: gst-plugins-base - MSVC doesn't have the rint function"
win: gst-plugins-base - MSVC doesn't have the round function