adjust for warning: warning repairs

Adapt more places where binutils-2.17 has changed the format of the
linker warning massages.

- 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

show more ...

Add regression tests to check whether GCC folds unsafe builtins and
actually shows the security warning. Also add some other cases
where GCC used to yield the warning but shouldn't (e.g. strncat
sim

Add regression tests to check whether GCC folds unsafe builtins and
actually shows the security warning. Also add some other cases
where GCC used to yield the warning but shouldn't (e.g. strncat
simplified into strcat).

show more ...