Bug 11660: remove disused tools/pdfViewer.pl

Bug 11660: remove disused tools/pdfViewer.pl

tools/pdfViewer.pl can be used to read artibrary files on the system.

It is actually an unused file, so leaving it around serves no purpose
and is dangerous.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
No regressions found.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit d1b6e0646fd6a70f6724189554e80aaa68aec64b)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>