bug#11669: 24.1; Build failure on amd64 with x32 ABI

[Ulrich Mueller]

> emacs-24 should get some form of band-aid "do not merge to trunk"
> fix for this, just in case.

I've now applied a somewhat different solution to the Gentoo package,
namely patching the m/amdx86-64.h file, see attached patch. (This
should also ensure that it isn't accidentally merged to trunk, because
the file doesn't exist there any more.)

--- emacs-24.1-orig/src/m/amdx86-64.h
+++ emacs-24.1/src/m/amdx86-64.h
@@ -17,6 +17,7 @@
 You should have received a copy of the GNU General Public License
 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
+#ifndef __ILP32__               /* Don't define for x32 ABI.  */
 #define BITS_PER_LONG           64
 #define BITS_PER_EMACS_INT      64
 
@@ -30,6 +31,7 @@
 #define EMACS_INT               long
 #define pI                     "l"
 #define EMACS_UINT              unsigned long
+#endif /* __ILP32__ */
 
 /* Define XPNTR to avoid or'ing with DATA_SEG_BITS */
 #undef DATA_SEG_BITS