Remove SWT references and related mac-specific changes from the build files.
ant test.hosted and test.web now works on a mac.

Patch by: amitmanjhi
Review by: fabbott, jat



git-svn-id: https://google-web-toolkit.googlecode.com/svn/branches/farewellSwt@6207 8db76d5a-ed1c-0410-87a9-c151d255dfc7