Fix for linux make check build failure

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 383 matching lines @@
         src/client/linux/linux_client_unittest_shlib
 CLEANFILES += \
         src/client/linux/linux_client_unittest_shlib
 
 check_PROGRAMS += \
         src/client/linux/linux_client_unittest
 
 if !DISABLE_TOOLS
 check_PROGRAMS += \
         src/common/dumper_unittest \
-        src/common/mac/macho_reader_unittest \
         src/tools/linux/md2core/minidump_2_core_unittest
+if X86_HOST
+check_PROGRAMS += \
+        src/common/mac/macho_reader_unittest
+endif
 endif
 endif LINUX_HOST
 
 if !DISABLE_PROCESSOR
 if SELFTEST
 check_PROGRAMS += \
         src/processor/stackwalker_selftest
 endif SELFTEST
 endif !DISABLE_PROCESSOR
 
@@ skipping 906 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 {} +