Fixes a regression introduced in
a9edb211e733b8b34e67ec3b4450567e9376986f where the .log files of the .sh
tests would not contain stderr.
* build-aux/test-env.in: Redirect stderr only when --quiet-stderr is
passed.
* Makefile.am (SCM_LOG_DRIVER): Add --quiet-stderr.
* pre-inst-env.in: Move to ...
* build-aux/pre-inst-env.in: ... here.
* test-env.in: Move to ...
* build-aux/test-env.in: ... here.
* configure.ac (AC_CONFIG_FILES): Adapt to this. Keep the generated
scripts in their current location which is $(top_builddir).