check for __pentium4__ when deciding whether to use bswap for

check for __pentium4__ when deciding whether to use bswap for

Sun May  2 03:51:59 2004  Manish Singh  <yosh@gimp.org>

        * glib/gtypes.h: check for __pentium4__ when deciding whether to
        use bswap for GUINT32_SWAP_LE_BE_IA32(). Fixes bug #141620.