add clone2 prototype to shutup warnings
add clone2 prototype to shutup warnings

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