rework the headers depedency so that it plays nice with parallel building
rework the headers depedency so that it plays nice with parallel building

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