Update fontconfig to 2.13.91

This new version speeds up cache initialization.

For the Android Viewer case, this significantly decreases the
time between the user selecting the first document
after app installation and the point in time it actually shows up
(e.g. from about 2 minutes to about 10 seconds on my Samsung
Galaxy S4).

Note: fontconfig 2.13.92 had issues and did not work properly
when quickly testing with Android Viewer, showed e.g. this line in
'adb logcat' output and crashed when opening a document with Asian
characters

stderr  : Fontconfig error: Cannot load config file from /data/user/0/<APP_ID>/etc/fonts/fonts.conf

So, go with version 2.13.91 for now.

This should probably also allow dropping the current workarounds
related to slow fontconfig cache initialization for the online-based
Android app, but unfortunately my builds of that app never
succeeded in properly loading/rendering any document, so I won't
touch that one for now...

tarball available for download at
https://www.freedesktop.org/software/fontconfig/release/fontconfig-2.13.91.tar.gz

Change-Id: I22c8d6de58ac9425931f884aab75841ccea0494a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/90095
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

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