buildgcc: Update reference toolchain

* GCC 4.8.1
 * binutils 2.23.2
 * GDB 7.6
 * ACPICA 20130626
 * Python 3.3.2

... this adds support for Aarch64. For Ron.

Change-Id: Idec91bcd615bc35c83373bd23d4681f1c8eb015c
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/3758
Tested-by: build bot (Jenkins)
Reviewed-by: David Hubbard <david.c.hubbard+coreboot@gmail.com>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

util/crossgcc/patches/gdb-7.6_pythonhome.patch

@@ -0,0 +1,19 @@
+diff -ur gdb-7.6/gdb/python/python.c gdb-7.6.patched/gdb/python/python.c
+--- gdb-7.6/gdb/python/python.c	2012-06-25 18:53:20.000000000 +0200
++++ gdb-7.6.patched/gdb/python/python.c	2012-10-24 15:28:37.422047.69 +0200
+@@ -1227,6 +1227,15 @@
+ 			     SLASH_STRING, "python", NULL));
+ #endif
+ 
++  char readlinkbuffer[BUFSIZ];
++  int readlinks = readlink("/proc/self/exe", readlinkbuffer, BUFSIZ - 1);
++  readlinkbuffer[readlinks] = 0;
++  char *executeablepath = dirname(readlinkbuffer);
++  char *pythonhome = malloc(strlen(executeablepath) + strlen("/../") + 2);
++  strcpy(pythonhome, executeablepath);
++  strcat(pythonhome, "/../");
++  setenv("PYTHONHOME", pythonhome, 1);
++
+   Py_Initialize ();
+   PyEval_InitThreads ();
+