config: include files redundant in EXTRA_DIST
config: include files redundant in EXTRA_DIST

The HEADERS Automake primary variable always gets it's files
distributed and installed.

Signed-off-by: Gaetan Nadon <8a8cc541338200f67d4d0bcb65c78b6166649462@videotron.ca>

mad-s/xf86-input-synaptics-absolute,mad-s/xf86-input-synaptics-absolute