Fix for nobase.test:

Fix for nobase.test:
* lib/am/header-vars.am (install_sh_DATA): New.
* lib/am/data.am (install-%DIR%%PRIMARY%): Declare and use
%DIR%%PRIMARY%_INSTALL, and set it to $(install_sh_DATA) instead
of $(INSTALL_DATA) for nobase_ targets.
* lib/am/lisp.am (install-%DIR%LISP): Likewise.
* lib/am/python.am (install-%DIR%PYTHON): Likewise.
* tests/nobase.test (configure.in): Append AC_OUTPUT.
* tests/Makefile.am (XFAIL_TESTS): Remove nobase.test.