* Makefile.am (maintainer-check): Check for unquoted $(DESTDIR) uses.

* Makefile.am (maintainer-check): Check for unquoted $(DESTDIR) uses.
* lib/am/data.am, lib/am/distdir.am, lib/am/java.am, lib/am/libs.am,
lib/am/lisp.am, lib/am/ltlib.am, lib/am/mans.am, lib/am/progs.am,
lib/am/python.am, lib/am/scripts.am, lib/am/texinfos.am: Quote
installation paths in install, uninstall, and installcheck rules,
as well as in am__installdirs variables.  This is for the sake
of paths containing spaces.
* lib/am/install.am (installdirs-am, installdirs): Do not try
to create "" directories.
* test/instspc.test: New file.
* test/Makefile.am (TESTS): Add instspc.test.
Report from James Amundson.