x11/xscreensaver: Update 6.14 => 6.15

• New hacks, worldpieces, bestill, bubblecolors, darktransit, downfall,

driftclouds, goldenapollian, noxfire, prococean, rigrekt, trainmandala,
trizm and universeball.

• mapscroller shows the name of the nearest major city, and has an updated

list of available map tile servers.

• Higher resolution Earth imagery in glplanet, dymaxionmap sphereeversion,

cubocteversion and platonicfolding.

• X11: xscreensaver-settings has a search field.
• X11: Excised the last remnants of XLFD-style font parsing.
• macOS, iOS: Text in right-to-left languages is rendered properly.
• Android: Most things display text properly.

https://www.jwz.org/xscreensaver/changelog.html

PR: 294171
Sponsored by: UNIS Labs