testsuite, Darwin: Update bad-mapper-1 after libiberty changes.

testsuite, Darwin: Update bad-mapper-1 after libiberty changes.

A recent change to libiberty has improved the process spawning on
older Darwin platforms.  This patch updates the expected test output
after the changes.

gcc/testsuite/ChangeLog:

	* g++.dg/modules/bad-mapper-1.C: Update expected test output
	for earlier Darwin.

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