testsuite, Darwin: Skip 113197 since it is unsupported by the linker.

Darwin's linker does not accept 'fpie' unless on final executables.

gcc/testsuite/ChangeLog:

	* gcc.dg/lto/pr113197_0.c: Skip for Darwin.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>