NPTL has tests that initializers work with various -std= options. Now
that we can rely on -std=gnu11 and -std=c11 being available, this
patch adds versions of those tests for those options.
Tested for x86_64 and x86 (testsuite).
* nptl/tst-initializers1-c11.c: New file.
* nptl/tst-initializers1-gnu11.c: Likewise.
* nptl/Makefile (tests): Add these new tests.
(CFLAGS-tst-initializers1-c11.c): New variable.
(CFLAGS-tst-initializers1-gnu11.c): Likewise.
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