Add new port graphics/multiraw, a parallel-execution batch converter for
camera raw format photographs using pthreads.
Multiraw uses the graphics/dcraw-m or graphics/dcraw ports and their
executables. dcraw-m is a modified version of dcraw which automatically
rotates exported thumbnails and has a camera timezone offset adjustment
variable.
WWW: https://dx.burplex.com/bin/multiraw.html
PR: ports/177492
Submitted by: Waitman Gobble <uzimac@da3m0n8t3r.com>