Fix build with newer C and refresh cc_x86 checksum, add AGENTS.md#44

krystophny wants to merge 1 commit intooriansj:masteroriansj/stage0:masterfrom

krystophny:fix-build-and-cc_x86-checksumkrystophny/stage0:fix-build-and-cc_x86-checksumCopy head branch name to clipboard