libc/ipc: Allow architectures to define their own __IPC_64 macro
libc/ipc: Allow architectures to define their own __IPC_64 macro

New architectures don't define ARCH_WANT_IPC_PARSE_VERSION in their kernel.
This means that every cmd passed to semctl,msgctl and shmctl is IPC_64 by
default. For these architectures we need to define __IPC_64 as 0. Existing
architectures are not affected by this change.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>

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

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