bug 10548: fix count of missing required dependencies by koha_perl_deps.pl

To test:

[1] ./koha_perl_deps.pl -m -u

If you have nothing missing, uninstall an optional component.

[2] ./koha_perl_deps.pl -m -u

You should get a number missing of at least 1.

[3] ./koha_perl_deps.pl -m -u -r

You should get the same number, even though the output is less.

[4] Apply patch

[5] ./koha_perl_deps.pl -m -u

Same results as in step 2.

[6] ./koha_perl_deps.pl -m -u -r

The number should differ from the results in step 3.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>