makes gtest-death-test_test.cc compile on platforms that don't support death tests; h/t to Steve Robbins for reporting the issue and suggesting the fix.

git-svn-id: http://googletest.googlecode.com/svn/trunk@657 861a406c-534a-0410-8894-cb66d6ee9925
allows gtest-config.in to work with an absoulte path for @top_srcdir@. h/t to Jimi Xenidis for reporting the issue and the fix.

git-svn-id: http://googletest.googlecode.com/svn/trunk@658 861a406c-534a-0410-8894-cb66d6ee9925