Drop \W3 from the MSVC compiler flags
Meson will add compiler specific warnings depending on the build type.
@@ -64,7 +64,6 @@ if cc.get_id() == 'msvc'
# glib's msvc_recommended_pragmas.h--please see that file for
# the meaning of the warning codes used here
test_cflags = [
- '-W3',
'-we4002',
'-we4003',
'-w14010',
