regex_old: make some internal helpers static
regex_old: make some internal helpers static

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

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