libc/ipc: Make IPC_64 0 for common-generic ABI
libc/ipc: Make IPC_64 0 for common-generic ABI

This avoids having to define __IPC_64 to 0 in each arch using the ABI

Signed-off-by: Vineet Gupta <af669d95a4c0de051445d4cafdbb2c5c4a2838be@synopsys.com>
Cc: Markos Chandras <5cdbcb0e11d2b5ebc39222958c54a1c6329d0c9d@imgtec.com>
Signed-off-by: Bernhard Reutner-Fischer <ce1ac9e9ad16abccd7821f371ad381197b4768ac@gmail.com>

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