[Cin] Build update

[M Nieuwenhoven]

Attached is a 7z file that allows CinelerraGG in AppImage format to be built on aarch64, as well as x86 64 and 32 bit.
Ir replaces linuxdeploy which was used since we switched to AppImage format a year ago, but that is not available for non-x86 platforms.
The new tool called makeappimage (800k) is built automatically when needed, and is a stripped-down version of linuxdeploy: its plugin-system has been removed, and the built system switched to the much simpler autotools (like CinGG itself). It is put in a new CinGG subdirectory calls tools (but for now this is the only tool :-) ).
To install, place the .7z file in the cinelerra5/cinelerra directory, and do "7z x bld_own_appimage.7z " . To use it, use the included ./bld_own_appimgage.sh . Name of the script should be changed in the future to "bld_appimage.sh" if OK for all.
Make sure the appimagetool for the platform is in your path, see the note in bld_own_appimage.sh .

The script also changes the configure script options depending on the hardware it is running on. @Andrew_R, does it need extra things for termux?

MatN
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