configure: allow GIT_REV to be read from VERSION file
needed for building outside of a git repo
release-source script needs bash
on some systems /bin/sh is a simplistic posix shell
fix null ptr dereference of GUIDialogCache. fixes #14065.
fixes #14030, osx x86_64 would crash on a throw, trying to open tiffs, basically cximage was referencing internal tiff headers instead of system headers, opps
[osx/ios] bump libtiff from 3.8.2 to 3.9.7 and configure without X11
changed, remove wrapping from cximage, obsolete with new Imagefactory
Merge pull request #1934 from wsnipex/gitrev

allow gitrev to be read from file