build: fix mksnapshot crash on sunos

Unconditionally compile V8 with -fno-strict-aliasing on all platforms.

gcc 4.5.2 on sunos generates bad code when -fstrict-aliasing is enabled, which
undoubtedly means that there are more buggy versions of gcc out there.

-fstrict-aliasing does not give a significant performance boost so let's just
disable it.

Fixes #3736.

configure

@@ -265,6 +265,8 @@ def compiler_version():
 
 
 def configure_node(o):
+  # TODO add gdb
+  o['variables']['v8_no_strict_aliasing'] = 1 # work around compiler bugs
   o['variables']['node_prefix'] = os.path.expanduser(options.prefix or '')
   o['variables']['node_install_npm'] = b(not options.without_npm)
   o['variables']['node_install_waf'] = b(not options.without_waf)