spawn: do not require C99 style
spawn: do not require C99 style

Simple style tweak to build with older standards.

Signed-off-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@gentoo.org>

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