Just file, not patch

I tested it like

CONFIG_OPTIONS="--without-thirdparty" ./bld_appimage.sh

and it seems to work (not sure what will happen if you pass both --disable-static-build and --enable-static-build. I moved --enable-static-build to its own line so you hopefully can just harmlessly comment it out.)

Since this is completely different then what is in the GIT source, is it what we should go with? My biggest concern is "makeimage" versus "linuxdeploy" and simplistically. This one has the advantage of adding the Manual documentation.

But it is easy enough to add the Manual documentation AND this patch to the current GIT one:

0003-Add-CONFIG_OPTIONS-env.-variable-handling-to-bld_app.patch