test/nptl: don't use c99 features if you don't need to
test/nptl: don't use c99 features if you don't need to

Signed-off-by: Austin Foxley <65462a1d10372f5df6b6641242ca623823c369f3@cetoncorp.com>

ndmsystems/uClibc,czankel/xtensa-uclibc,ndmsystems/uClibc,foss-xtensa/uClibc,czankel/xtensa-uclibc,majek/uclibc-vx32,m-labs/uclibc-lm32,groundwater/uClibc,brgl/uclibc-ng,ffainelli/uClibc,kraj/uClibc,kraj/uclibc-ng,atgreen/uClibc-moxie,mephi42/uClibc,hjl-tools/uClibc,kraj/uclibc-ng,ndmsystems/uClibc,kraj/uclibc-ng,skristiansson/uClibc-or1k,hjl-tools/uClibc,wbx-github/uclibc-ng,ffainelli/uClibc,ffainelli/uClibc,groundwater/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,mephi42/uClibc,mephi42/uClibc,ysat0/uClibc,ddcc/klee-uclibc-0.9.33.2,kraj/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,foss-xtensa/uClibc,m-labs/uclibc-lm32,hjl-tools/uClibc,ysat0/uClibc,mephi42/uClibc,hjl-tools/uClibc,wbx-github/uclibc-ng,brgl/uclibc-ng,m-labs/uclibc-lm32,waweber/uclibc-clang,ffainelli/uClibc,brgl/uclibc-ng,m-labs/uclibc-lm32,foss-for-synopsys-dwc-arc-processors/uClibc,atgreen/uClibc-moxie,hwoarang/uClibc,skristiansson/uClibc-or1k,ddcc/klee-uclibc-0.9.33.2,skristiansson/uClibc-or1k,foss-xtensa/uClibc,ysat0/uClibc,ndmsystems/uClibc,kraj/uClibc,atgreen/uClibc-moxie,ddcc/klee-uclibc-0.9.33.2,foss-for-synopsys-dwc-arc-processors/uClibc,groundwater/uClibc,hwoarang/uClibc,ysat0/uClibc,skristiansson/uClibc-or1k,ddcc/klee-uclibc-0.9.33.2,groundwater/uClibc,majek/uclibc-vx32,waweber/uclibc-clang,kraj/uClibc,czankel/xtensa-uclibc,waweber/uclibc-clang,majek/uclibc-vx32,foss-xtensa/uClibc,kraj/uclibc-ng,groundwater/uClibc,waweber/uclibc-clang,hwoarang/uClibc,brgl/uclibc-ng,wbx-github/uclibc-ng,ffainelli/uClibc,hwoarang/uClibc,czankel/xtensa-uclibc,wbx-github/uclibc-ng,atgreen/uClibc-moxie,hjl-tools/uClibc,majek/uclibc-vx32