2005-07-04  Riccardo Mottola  <rmottola@users.sf.net>

	* config/powerpc/netbsd1/jit3-md.h
	Added to start JIT support

	* config/powerpc/darwin/jit3-md.h
	A small comment added

	* config/powerpc/linux/md.h, config/powerpc/netbsd1/md.h
	Changed macros to use ucontext_t instead of sigcontext. Also unified them to use macros provided by netbsd that are portable among different platforms to get SP and PC. First patches to get JIT ported.