Modernize, improve and/or fix various test scripts. * tests/symlink3.test: Deleted, separated into two new, more complete tests ... * tests/forcemiss.test: ... this one ... * tests/forcemiss2.test: ... and this one. * tests/symlink2.test: Enable `errexit' shell flag, make test stricter, and skip it if symlink creation is not supported. * tests/postproc.test: Enable `errexit' shell flag, related changes, and a couple of unrelated cosmetic changes. * tests/recurs.test: Use the `configure.in' stub created by `./defs', rather than writing one from scratch. Make grepping of Automake stderr slighty stricter. * tests/substtarg.test: Likewise. * tests/strip.test: Likewise, and move the call to `set -e' earlier (just after the inclusion of `./defs'). Also, make sure that the script installed by `make install-script' is equal to the original one. * tests/substref.test: Use the `configure.in' stub created by `./defs', rather than writing one from scratch. Move the call to `set -e' earlier (just after the inclusion of `./defs'). Avoid to explicitly export CC for configure (that's already done in ./defs). Avoid potential problems with unpredictable make output. Finally, make grepping of Makefile.in stricter. * tests/substre2.test: Ensure verbose printing of the captured make's output, and make its grepping slighty stricter. * tests/cygwin32.test: Enable `errexit' shell flag, and related changes. Also, do not create useless dummy source/data files. * tests/scripts.test: Likewise. * tests/recurs2.test: Likewise. Also, use the `configure.in' stub created by `./defs'. * tests/Makefile.am (TESTS): Updated. Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>