nls: always use XCOMM instead of # for comments in Compose.pre files

Lines starting with # are considered as preprocessor directives in the
.pre files.

Fixes warnings like:
<stdin>:3:0: error: invalid preprocessing directive #Khmer

Signed-off-by: Ran Benita <ran234@gmail.com>
Signed-off-by: James Cloos <cloos@jhcloos.com>
Remove dead USE_OWN_COMPOSE-protected code

The build doesn't provide any way to define this option. It also refers
to files (imComp.h) and functions (e.g. XimCompInitTables(),
XimCompProcessSym()) which are not found anywhere, and the ordinary
Compose implementation in xim doesn't use any of it.

Signed-off-by: Ran Benita <ran234@gmail.com>
Reviewed-by: Julien Cristau <jcristau@debian.org>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>