*.o[sS]: depend on pregen
*.o[sS]: depend on pregen

allows 'make realclean && make utils' to behave properly

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

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