[Bug testsuite/78740] test case powerpc/pr78691-ppc.c fails starting with its introduction in r243335

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78740

--- Comment #3 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Yes, that works:

Running
/home/wschmidt/gcc/gcc-mainline-test/gcc/testsuite/gcc.target/powerpc/powerpc.exp
...

                === gcc Summary for unix/-m64 ===

# of unsupported tests          1