This fixes the build with ffmpeg 4.4.
* gnu/packages/patches/ppsspp-disable-upgrade-and-gold.patch: Rebase patch.
* gnu/packages/emulators.scm (ppsspp): Update to 1.11.3-1.69fa207.
[source]: Adjust origin snippet to unbundle the newly added zstd library.
* gnu/packages/emulators.scm (ppsspp): New variable.
* gnu/packages/patches/ppsspp-disable-upgrade-and-gold.patch: New file.
* gnu/local.mk: Register it.
Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>