patch 7.4.1907

Problem:    Warnings from 64 bit compiler.
Solution:   Change type to size_t. (Mike Williams)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1907,
 /**/
     1906,
 /**/