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add getcontext and setcontext for i386 and x86_64
update syscalls lots of fixes from Markus FX Oberhumer: * better signal handling error detection * setjmp.S on i386 * getenv on i386 * sys/stat.h -malign-double fix * update fcntl.h for MIPS to 2.6.13 version * jmp_buf is 40*8 instead of 58*8 on ppc64. * This patch fixes the section of the TOC entries on ppc64 * libstdc++ updates for gcc 4 * remove cstddef and cwchar (no longer needed) * int -> ssize_t for read and write * sigjmp.c: __mask_was_saved was not set in all cases! * another round of ILP64 cleanups
add sigisemptyset, sigandset and sigorset (John K. Hohm) minor additions to make gdb 6.3 happy (John K. Hohm) ld.so support for gdb (John K. Hohm) implement nice(2) via setpriority() if there is no nice syscall