build: fix distcheck by removing files manually

build: fix distcheck by removing files manually

These files are not getting cleaned up as they are not integrated into the rest
of our build system. These are the extra makefiles to build build only eina, eo,
etc.

The trick with -C clean does not work here for me and this is the only way I
found to get a distcheck going through. Which is kinda important given we want to
do the first alpha tarballs for 1.18 next Monday.