Hack round the FreeBSD iconv support in Freebsd 10. In 10 libc now
supports iconv however iconv.h is present under /usr/local.
Start to add support to build qemu for MinGW via a Cxc. This is a
work in progress and contains lots of hidden traps.
In config.py separate out of the canadian build status.
Add a pkg-config look alike command so packages that use pkg-config can
build if pkg-config is not present on a host.
Add support to query package config from configuration scripts.
