New port: devel/objconv

This utility can be used for converting object files between COFF/PE,
OMF, ELF and Mach-O formats for all 32-bit and 64-bit x86 platforms.
Can modify symbol names in object files. Can build, modify and convert
function libraries across platforms. Can dump object files and
executable files. Also includes a very good disassembler supporting the
SSE4, AVX, AVX2, AVX512, FMA3, FMA4, XOP and Knights Corner instruction
sets.

WWW: https://www.agner.org/optimize

PR: 252674
Submitted by: Robert Clausecker <fuz@fuz.su>