tst-cleanupx4 is linked with tst-cleanupx4.o and tst-cleanup4aux.o.
Since tst-cleanupx4.o is compiled from tst-cleanup4.c with -fexceptions,
tst-cleanup4aux.c should also be compiled with -fexceptions.
Tested on x86-64 and i686.
[BZ #18645]
* nptl/Makefile (extra-test-objs): Add tst-cleanupx4aux.o.
(test-extras): Add tst-cleanupx4aux.
(CFLAGS-tst-cleanupx4aux.c): New. Set to -fexceptions.
($(objpfx)tst-cleanupx4): Replace tst-cleanup4aux.o with
tst-cleanupx4aux.o.
* nptl/tst-cleanupx4aux.c: New file.
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