Import v0.13.0 vendor code.
Merge branch 'vendor' to bring in 0.13.0 code.

Conflicts:
	Makefile
	block/raw-posix.c
	configure
	cpu-exec.c
	fpu/softfloat-native.h
	vl.c
Port error reporting to 0.13.0 API.
Fix installation directory layout.
Disable optimizations as they're leading to immediate crashes.

These are probably due to using a much newer compiler than what was
available when these sources were made available in 2010. The hope
is that newer versions either deal with that or have specific
optimization flags disabled.