Add no-strict-aliasing to FreeBSD/gcc42 builds

Remove the patch that was not getting applied on rake build on a
buildhost and add a conditional make flag in builder.rb. This commit
fixes #68
Add methods for make flags to Libv8::Builder
Get rid of GYPFLAGS modifications

The issue in v8 that prevented successful builds under MacOS has
been resolved and this makes GYPFLAGS modification unnecessary.
(see https://github.com/cowboyd/libv8/pull/71#issuecomment-11937331)
Dispose of unecessary patches.
Merge pull request #71 from ignisf/freebsd-gcc42

Add no-strict-aliasing to FreeBSD/gcc42 builds, remove vestigial patches.