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This is instead of installing them first in one place, then moving them.
It also fixes the previous change, which was incorrect for
the -disable-ns-self-contained case.

* configure.in (LEIM_INSTALLDIR): New output variable.

* leim/Makefile.in: (install_prefix): New.
(LEIM_INSTALLDIR): New, set by configure.
(install): Use LEIM_INSTALLDIR.