libc: Fix _obstack_newchunk public symbol vis
libc: Fix _obstack_newchunk public symbol vis

975bca165c3e10e74c05c0384fd58f45a7025a3c avoided relocations to
_obstack_newchunk used by obstack_vprintf but missed to enable the
corresponding public symbol which is used by the obstack macros.

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

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