only build dump_syms_mac for x86 hosts

Makefile.am

 ## Process this file with automake to produce Makefile.in
 
 # Copyright (c) 2011, 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
@@ skipping 329 matching lines @@
 if LINUX_HOST
 bin_PROGRAMS += \
         src/client/linux/linux_dumper_unittest_helper
 
 if !DISABLE_TOOLS
 bin_PROGRAMS += \
         src/tools/linux/core2md/core2md \
         src/tools/linux/dump_syms/dump_syms \
         src/tools/linux/md2core/minidump-2-core \
         src/tools/linux/symupload/minidump_upload \
-        src/tools/linux/symupload/sym_upload \
+        src/tools/linux/symupload/sym_upload
+if X86_HOST
+bin_PROGRAMS += \
         src/tools/mac/dump_syms/dump_syms_mac
 endif
+endif
 endif LINUX_HOST
 
 
 ## Tests
 if !DISABLE_PROCESSOR
 check_PROGRAMS += \
         src/common/test_assembler_unittest \
         src/processor/address_map_unittest \
         src/processor/basic_source_line_resolver_unittest \
         src/processor/cfi_frame_info_unittest \
@@ skipping 945 matching lines @@
         src/tools/windows/dump_syms/dump_syms.vcproj \
         src/tools/windows/dump_syms/run_regtest.sh \
         src/tools/windows/dump_syms/testdata/dump_syms_regtest.cc \
         src/tools/windows/dump_syms/testdata/dump_syms_regtest.pdb \
         src/tools/windows/dump_syms/testdata/dump_syms_regtest.sym \
         src/tools/windows/symupload/symupload.cc \
         src/tools/windows/symupload/symupload.vcproj
 
 mostlyclean-local:
         -find src -name '*.dwo' -exec rm -f {} +