glib and dlfcn exist on windows, but sphinx code uses a lot of
Fixes the following build error on mingw-fedora
../../../util/cairo-sphinx/sphinx.c:8:22: fatal error: sys/mman.h: No such file or directory
*** Bug 63044 has been marked as a duplicate of this bug. ***
Created attachment 77338 [details] [review]
build-sys: do not try to build util/sphinx on Windows
Thanks, applied to master for 1.14.0.