testsuite, Darwin: Allow for an undefined symbol [PR114036].

testsuite, Darwin: Allow for an undefined symbol [PR114036].

Darwin's linker defaults to requiring all symbols to be defined at
static link time (unless specifically noted or dynamic lookuo is
enabled).

For this test, we just need to note that the symbol is expected to
be undefined.

	PR testsuite/114036

gcc/testsuite/ChangeLog:

	* gcc.misc-tests/gcov-14.c: Allow for 'Foo' to be undefined
	on Darwin link lines.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
(cherry picked from commit ad8e34eaa870608e2b07b4e7147e6ef2944bb8b5)