buildsys: use single slash version of -print-whatever
buildsys: use single slash version of -print-whatever

The double slash variants are not documented (doc bug?) so better use
the single slash variants like we usually do.

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

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