patch 9.0.0054: compiler warning for size_t to int conversion

Problem:    Compiler warning for size_t to int conversion.
Solution:   Add type cast. (Mike Williams, closes #10741)

src/insexpand.c

@@ -643,7 +643,7 @@ ins_compl_infercase_gettext(
 	    if (ga_grow(&gap, IOSIZE) == FAIL)
 		return (char_u *)"[failed]";
 	    STRCPY(gap.ga_data, IObuff);
-	    gap.ga_len = STRLEN(IObuff);
+	    gap.ga_len = (int)STRLEN(IObuff);
 	}
 	else if (has_mbyte)
 	    p += (*mb_char2bytes)(wca[i++], p);

src/version.c

@@ -735,6 +735,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    54,
 /**/
     53,
 /**/