Mettle v0.12.0

Implemented COFF IMAGE_SCN_LNK_NRELOC_OVFL support in binary_emitter.c (write) and linker/coff_reader.c (read) so sections with >65535 relocations encode the real count in a synthetic first relocation record instead of erroring.

What's Changed

• changes by @marquisburg in #43

Full Changelog: v0.11.0...v0.12.0