various changes updates
allow JPEG/imexif.c to build on C89 compilers
[rt #75560] don't fallback to using DynaLoader when XSLoader fails
This was masking errors when the loadable object failed to load for
some reason other than XSLoader being unavailable.
The alternative was to only eval the load of XSLoader and keep the
fallback, but XSLoader has been core perl for a while.
sub-module version bumps and Changes notes in prep for dev release
make it so we can release sub-dists from the Imager git tree
progressive JPEG support