libpthread/x86_64: fix clean
libpthread/x86_64: fix clean

Signed-off-by: Roman I Khimov <9c65a1c4e83e5c30b8a170f663f3fbf79112fbfa@altell.ru>
Signed-off-by: Austin Foxley <65462a1d10372f5df6b6641242ca623823c369f3@cetoncorp.com>

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