buildsys: fix typo in help
buildsys: fix typo in help

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

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