- fix install_headers on hosts where ld does not support gnu hash-style but   uClibc is configured to use it.
- fix install_headers on hosts where ld does not support gnu hash-style but
  uClibc is configured to use it.

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