lib: Add missing config.h include to next_prime.c

This is the last remaining C source file as of this commit
without the standard conditional inclusion of config.h
as the very first header.

      * lib/next_prime.c: add missing config.h header.

Signed-off-by: Michael Pratt <mcpratt@pm.me>

diff --git a/lib/next_prime.c b/lib/next_prime.c
index f2c921e3a091f2a3897c417a566b88a4a57b1217..97c425e19d143d1dc319a1364a75197f3e973d4a 100644 (file)
--- a/lib/next_prime.c
+++ b/lib/next_prime.c
@@ -27,6 +27,10 @@
    the GNU Lesser General Public License along with this program.  If
    not, see <http://www.gnu.org/licenses/>.  */
 
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
 #include <stddef.h>