Make some `confh*.test' tests more "semantic" (plus tweakings). * tests/confh.test: Run "autoconf", "configure" and "make check", instead of munging/grepping the generated `Makefile.in'. * tests/confh4.test: Relax the grepping of Makefile.in w.r.t. white spaces. Do not create usless dummy source file `foo.c' and useless dummy header file `acconfig.h'. (configure.in): Remove superfluous call to `AC_OUTPUT'. * tests/confh6.test: Add trailing `:' command. * tests/confh7.test: In comments, add reference to ... * tests/confh8.test: ... this new test, "semantic" sister of `confh7.test'. * tests/Makefile.am (TESTS): Updated. Prompted by a report from Ralf Wildenhues.