This adds the capability to compile got-portable on FreeBSD.

This commit modifies the GoT main branch to be able to compile it under linux.

The singly-linked tail queue macros were added to OpenBSD 6.9 and are more widely available on other systems. ok stsp

This way, the size of a raw object is the same regardless of whether the object was found in a loose object file or in a pack file.

This will be required by a future 'gotadmin pack' command.

ok millert, naddy

ok millert, naddy

A symptom of this was a segfault in 'got blame distrib/miniroot/install.sub' with the OpenBSD src.git from github, reported by jrick. The problem was that the commit graph traversed one commit too far. This could be more easily reproduced with 'got log': got log -c 05f568 -P distrib/miniroot/install.sub Which listed two commits instead of just the first one: 05f568ecc6aadefa1aff9064a29e798874a71409 <-- install.sub first created here 7c0d87f00e480cdf004324dad6f3e6f4418f8f42 "distrib/miniroot" exists in 7c0d87f00e480cdf004324... but not in the parent of this commit. Ensure that we traverse the full path in tree1 even if an intermediate tree2 cannot be opened. Instead of reporting success and a file change if we can't traverse further through tree2, we now hit this failing attempt to open the file 'install.sub' in tree object 180aa33df8d1 (tree1): te1 = find_entry_by_name(tree1, seg, seglen); if (te1 == NULL) { err = got_error(GOT_ERR_NO_OBJ); goto done; } fix tested and ok jrick

ok millert

POSIX says the limits defined there are available from <limits.h>, which almost all affected source files already included anyway. ok millert stsp

ok stsp