tree-wide: never use the off_t unless glibc makes us use it

off_t is a really weird type as it is usually 64bit these days (at least
in sane programs), but could theoretically be 32bit. We don't support
off_t as 32bit builds though, but still constantly deal with safely
converting from off_t to other types and back for no point.

Hence, never use the type anymore. Always use uint64_t instead. This has
various benefits, including that we can expose these values directly as
D-Bus properties, and also that the values parse the same in all cases.

src/systemctl/systemctl.c

@@ -4623,7 +4623,7 @@ static int cat_file(const char *filename, bool newline) {
                ansi_highlight_off());
         fflush(stdout);
 
-        return copy_bytes(fd, STDOUT_FILENO, (off_t) -1, false);
+        return copy_bytes(fd, STDOUT_FILENO, (uint64_t) -1, false);
 }
 
 static int cat(sd_bus *bus, char **args) {