libregex: Remove all uses of `~str` from `libregex`
libgraphviz: Remove all uses of `~str` from `libgraphviz`.
liblog: Remove all uses of `~str` from `liblog`
libglob: Remove all uses of `~str` from `libglob`
libsemver: Remove all uses of `~str` from `libsemver`
libtime: Remove all uses of `~str` from `libtime`