lib: only include fetch.h where required

This results in a lot of places where limits.h was missing, so
this diff is larger than necessary.

lib/package_remove.c

@@ -23,14 +23,15 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <stdio.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <limits.h>
 #include <stdbool.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <errno.h>
-#include <dirent.h>
-#include <libgen.h>
-#include <fcntl.h>
 #include <unistd.h>
 
 #include "xbps_api_impl.h"