util/u_snprintf: Don't redefine HAVE_STDINT_H as 0.
We now always guarantee availability of stdint.h on MSVC -- if MSVC doesn't supply one we use our own. Cc: "10.4" <mesa-stable@lists.freedesktop.org> Reviewed-by:Brian Paul <brianp@vmware.com> Reviewed-by:
Roland Scheidegger <sroland@vmware.com> (cherry picked from commit 4b6e9365)