ocaml: Adding OCaml 4.0.2 compiler.
ocaml-camlp4: Adding OCaml Preprocessor and Pretty-Printer.
ocaml-opam: Adding OCaml Package Manager.
Merge pull request #262 from JillTyrell/ocaml

Adding OCaml and related tooling.
luajit: bump to latest
lua: bump to latest
lua: fix deps
update pkg skeletons (exit 1 no longer needed)
make perl packages fit for x-compile by disabling tests

"make test" assumes that the packages are built natively and can be
used with the perl binary in $PATH.
that's not true for cross-compilation when C sources are involved.
also the dependency chain of perl modules reachable via the host
perl interpreter usually does not match the ones in the cross-compile
sysroot.

whether the perl packages use the correct $CC as passed via the
environment is not clear yet, as their Makefiles default to non-verbose
mode.
additionally it's possible that some of them try to reference stuff
which is installed in the host directory structure and mess things up
that way.
yasm: fix for x-compile
glibmm: fix for x-compile
zziplib: fix for x-compile
milkytracker: fix for x-compile
atkmm: fix for x-compile
pangomm: fix for x-compile
boost: fix for x-compile
gtkmm: fix for x-compile
libgc: fix for mips

for some reason, on mips boehm assumes libc provides a symbol called
__data_start, which will cause link errors when trying to link against
libgc.so.
add a cpp define so it instead uses the same lookup mechanism as on
other archs.
inkscape: fix for x-compile
Update to R50b