[Libreoffice] [Patch] Accelerate Perl installer builder

[Jan Darmochwal]

Hi!

This patch speeds up make_installer.pl by about 5% on linux
(probably much less speedup on windows). The Patch is LGPLv3+/MPL.

The next patch will focus on Windows speed (if I succeed in setting
up a Windows build environment for LibreOffice).

Jan