Added string.h header for strerr prototype.
Added string.h header for strerr prototype.

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