Add recipe for libmpdclient

No patch required, fixes have already been upstreamed.
libmad: Fix PROVIDES_devel
physfs: Fix PROVIDES_devel
mpg123: Fix PROVIDES_devel
mpg123: Fix pkg-config file installation
Add Cython recipe.
Make SDL2 work better

* Fix a compilation problem on gcc2
* Use dlopen for shared library suport, as the custom code doesn't look
for libs in the right place (fixes libSDL2 not finding libpng, for
example).
Python 2.7: mark as working on x86_gcc2

The recipe works and builds a perfectly working Python. Upgrading the
system from Python 2.6 is a problem, but this one can be installed in
home and works fine, so this is not a problem with the recipe.
xz_utils: Split devel:liblzma into a separate package.
libattica: working recipe.

If anyone knows a better way to call CMake than the hack I used after
"make install", please tell me. I already tried INSTALL_LIB_DIR and
friends.
CMake: update to 3.0.0 final.
libattica: fix version and install.

PulkoMandy suggested using CMake 3, but that didn't really help...
Strigi: add working recipe.
strigi: copy CMake modules into the correct directory and the devel package.
ninja: v1.5.1.
xz_utils: devel package requires base package.
strigi: devel package requires base package.
dbus: working recipe.
WIP recipe for Open Watcom.

Build fails after the bootstrapping stage, as executables compiled with
Watcom tools crash the runtime loader.
Forgot to add Watcom licence file.