progs: EGL/X progs should link to libX11.

Since 5a459d58fca2b71cb77c39f98df8a81ce6298421, libEGL no longer links
to libX11.  Add the dependency to affected progs and cleanup
prog/egl/Makefile.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
3 files changed