- fix OpenEXR.pc

- increase timeout for IlmImf test

- version update to 2.4.0
* Completely re-written CMake configuration files
* Improved support for building on Windows, via CMake
* Improved support for building on macOS, via CMake
* All code compiles without warnings on gcc, clang, msvc
* Cleanup of license and copyright notices
* floating-point exception handling is disabled by default
* New Slice::Make method to reliably compute base pointer for a slice.
* Miscellaneous bug fixes
* CVE-2018-18444 Issue #351 Out of Memory
* CVE-2018-18443 Issue #350 heap-buffer-overflow
- upstream does not provide gpg signature anymore
https://github.com/openexr/openexr/issues/565
- modified sources
% baselibs.conf
- deleted patches
- openexr-CVE-2017-14988.patch (upstreamed)
- openexr-CVE-2017-9111,9113,9115.patch (upstreamed)
- openexr-CVE-2018-18444.patch (upstreamed)
- deleted sources
- openexr-2.3.0.tar.gz.sig (not needed)
- openexr.keyring (not needed)