Initialize LLVM target and asmprinter for the native and extra targets. Uses some CMake hackery to get the native LLVM target name, since it only provides a conveniance function for initializing the native target and not the native asmprinter.

[Environment]

DFLAGS=-I%@P%/../lphobos -I%@P%/../import -L-L%@P%/../lib
# -R%@P%/../lib