* [openimageio] build with libraw
* patch: replace 'LibRaw_r_LIBRARIES' occurrences by 'LibRaw_LIBRARIES' since libraw port installs 'raw_r' library as 'raw'
* activate USE_LIBRAW
* declare dependency to libraw in CONTROL file
* [openimageio] 'libraw' as Feature
* [openimageio] Use PATCHES parameter of vcpkg_from_github()
