Use config.h rather than passing all defs in CFLAGS

src/share/iconvert.c

@@ -16,6 +16,10 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #ifdef HAVE_ICONV
 
 #include <assert.h>

src/share/utf8.c

@@ -24,6 +24,10 @@
 #include <stdlib.h>
 #include <string.h>
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include "utf8.h"
 #include "charset.h"