Commit Briefs
got_error_from_errno -> got_error_prefix_errno
also add got_error_prefix_errno2 and got_error_prefix_errno3 which should hopefully all be merged into a single function with variadic args (but can't alloc mem)
check for size_t overflow in got_delta_apply_in_mem()
like libgit2's c15771104 (delta: fix overflow when computing limit)