- Add jasper-2.0.21-glut.patch: Fix glut.h detection
See https://github.com/jasper-software/jasper/issues/247

- Update to 2.0.21:
* Fix ZDI-15-529
https://github.com/jasper-software/jasper/pull/245
* Fix CVE-2018-19541 in decoder
https://github.com/jasper-software/jasper/pull/244

- Update to 2.0.20:
* Fixed several ISO/IEC 15444-4 conformance bugs
* Fixed new variant of CVE-2016-9398
* Disabled the MIF codec by default for security reasons (but it is still
included in the library);
in a future release, the MIF codec may also be excluded from the
library by default
* Added documentation for the I/O streams library API
* Improved adherance to specification
- Move to GitHub repo https://github.com/jasper-software/jasper
- Update URL to https://jasper-software.github.io/jasper