libc/stdlib: localize __unix_grantpt
libc/stdlib: localize __unix_grantpt

When ASSUME_DEVPTS is disabled, we end up exporting __unix_grantpt and
get a reloc to it from grantpt.  Mark it static to fix all of that.

Reported-by: Michael Deutschmann <17b9e1c64588c7fa6419b4d29dc1f4426279ba01@talamasca.ocis.net>
Signed-off-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@gentoo.org>

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