tools/automake: clean up build recipes

tools/automake: clean up build recipes

The configure option datarootdir
defaults to PREFIX/share.

The Host/Clean define should be Host/Uninstall
otherwise it is removing the build directory
before there is a chance to try "make uninstall"
in that directory.
Host/Clean/Default is no longer defined.

Consolidate the install stage with Host/Uninstall,
since it is essentially uninstalling before installing.

Signed-off-by: Michael Pratt <mcpratt@pm.me>