Fixes after the merge with buildroot 2012.11:

* Bump some version numbers in the defconfig files (toolchain=>201203, gdb=>7.2, busybox=>1.20) because the previous versions are obsolete/deprecated
* Install locales for the new toolchain version
* Don't use explicitly named sourceforge mirrors because BR2_SOURCEFORGE_MIRROR was eliminated in 2012.08
* Remove third party packages (boost, bluez_utils, yajl) to prevent them from clashing with the mainline versions
* Regenerate udev patches against udev-182
* toolchainfile.cmake is now generated in $(HOST_DIR)/usr/share/buildroot/
* Remove sdl-fix__XGetRequest_undefined.patch because it is now included upstream
* Host version of sdl needs a host version of alsa-lib
Fix compilation of the lirc package in cases where the build host has a different version of libusb-config