* Makefile.am (maintainer-check): Catch occurrences of `$MAKE foo=bar' in the testsuite. Suggest using `foo=bar $MAKE -e' instead. * tests/ansi3.test, tests/ansi5.test, tests/subobj3.test: Use $MAKE -e. This fixes a ansi5.test failure with Solaris make. * tests/defs: Unset $srcdir, and set $testsrcdir to its old value. * tests/installsh.test (AUTOMAKE, ACLOCAL): Use $testsrcdir.