graphics/ilmbase: graphics/openexr: update to v2.5.0

ChangeLog:

• https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v2.5.0

• Bump PORTREVISION of all consumers except py-openimageio (BROKEN).

• cad/PrusaSlicer: LIB_DEPENDS: remove version from libHalf.so BUILD_DEPENDS+=qt5-buildtools as package (needed on bare metal builds) USE_GL+=gl USES+=pkgconfig (needed to find libHalf)