add a tiny hack so that the headers target isnt rebuilt all the time, only when it should be
add a tiny hack so that the headers target isnt rebuilt all the time, only when it should be

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