only build dump_syms_mac for x86 hosts

configure.ac

 # Copyright (c) 2006, Google Inc.
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 77 matching lines @@
 AM_CONDITIONAL(LINUX_HOST, test x$LINUX_HOST = xtrue)
 
 # Only use Android support headers when compiling for Android
 case $host in
   *-android*)
     ANDROID_HOST=true
     ;;
 esac
 AM_CONDITIONAL(ANDROID_HOST, test x$ANDROID_HOST = xtrue)
 
+# Some tools (like mac ones) only support x86 currently.
+case $host_cpu in
+  i?86|x86_64)
+    X86_HOST=true
+    ;;
+esac
+AM_CONDITIONAL(X86_HOST, test x$X86_HOST = xtrue)
+
 AC_ARG_ENABLE(processor,
               AS_HELP_STRING([--disable-processor],
                              [Don't build processor library]
                              [(default is no)]),
               [case "${enableval}" in
                  yes)
                    disable_processor=false
                    ;;
                  no)
                    disable_processor=true
@@ skipping 79 matching lines @@
               [selftest=false])
 AM_CONDITIONAL(SELFTEST, test x$selftest = xtrue)
 
 AC_CONFIG_FILES(m4_flatten([
   breakpad.pc
   breakpad-client.pc
   Makefile
 ]))
 
 AC_OUTPUT