nptl: avoid spurious rebuilds of libpthread*.a
nptl: avoid spurious rebuilds of libpthread*.a

Signed-off-by: Bernhard Reutner-Fischer <ce1ac9e9ad16abccd7821f371ad381197b4768ac@gmail.com>

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