xtensa: sysdep.h needs to include sys/syscall.h
xtensa: sysdep.h needs to include sys/syscall.h

The Xtensa version of sysdep.h didn't include sys/syscall.h. This header
file is, for example, needed by not-cancel.h, which uses the
INTERNAL_SYSCALL macro.

Signed-off-by: Chris Zankel <711c73f64afdce07b7e38039a96d2224209e9a6c@zankel.net>

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