rsyslog: add 'else' clause to mysql and postgresql support

Having 'else' clauses handling the absence of mysql and postgresql
support to explicitly disable such features helps to avoid
misdetection of system-installed packages.

Signed-off-by: Thomas Petazzoni <[email protected]>

Merge branch 'master' of https://github.com/mistifyio/buildroot

libglade: fix license information

Signed-off-by: Thomas Petazzoni <[email protected]>