This reverts commit 21f4a15c90.
It breaks make distcheck. Hard to track down as the error messages came
in po processing and looked like this:
0:10:58.392 make[4]: *** No rule to make target `.deps/enlightenment_sys-e_sys_main.Po'. Stop.
The subdir-objects confused our build setup. If anyone thinks this is
still needed and has a better fix go ahead.