Just minor changes in the AppImages, but I updated them for the month because somehow I mistakenly left out dlfcn from system installs (choice of syslib programs) as recently discovered by Andrew.

Andrew/Terje: are we at the point where "qsv" should be added as a choice in Settings->Preferences, Performance "Use HW Device"?

****  GIT for Cinelerra-GG has the following changes from 04/01/2026-04/30/2026  ****

Andrew-R work:
For BlendAlgebra, dlfcn was missing from system installs. Fixed so that now picking syslib correctly
 opens folder with preinstalled programs.
For Termux, a52 and mjpegtools build changes needed:
 - fix mjpegtools build with clang/termux by setting cflags to -std=gnu11,
- add std=c11 to a52 cflags which fixes autoconf 2.73 + clang 21.1 build on termux/aarch64,
+ option of “termux” added to blds/bld_prepare.sh as requested by user.
Libaom “make” parameters modified to build with nasm instead of yasm so that older systems, such as
 ubuntu 16, will successfully compile current libaom version 3.8.0.
For newer Nasm version 3.01 error of “Unsupported nasm: multipass optimization not supported”
 when building libaom has been fixed by adding another patch. Early discovery of issue by Andrea.
Added to cinelerra/ffmpeg.c QSV hardware decode option to facilitate Terje testing.