- adjust getcwd-1.c.exp.gcc{3,4} after the getwd linker warning got added
- adjust gcc-builtins to use the same approach as gcc-bounds
- enable gcc-bounds and gcc-builtins in the default regression s

- adjust getcwd-1.c.exp.gcc{3,4} after the getwd linker warning got added
- adjust gcc-builtins to use the same approach as gcc-bounds
- enable gcc-bounds and gcc-builtins in the default regression suite
now that everything passes

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Lots more regression tests to test builtins for gcc3 and various icky
corner cases. need to separate gcc2/gcc3 output expectations since
the error formats have diverged.