patch 9.2.0179: MS-Windows: Compiler warning for converting from size_t to int

Problem:  MS-Windows: Compile warning for converting from size_t to int
          breaks the Appveyor CI (after v9.2.0168)
Solution: Explicitly cast to int in convert_string() (ichizok).

closes: #19722

Signed-off-by: ichizok <gclient.gaap@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/strings.c

@@ -1218,7 +1218,7 @@ convert_string(string_T *str, char_u *from, char_u *to, string_T *ret)
     }
     else
     {
-	int len = str->length;
+	int len = (int)str->length;
 	ret->string = string_convert(&vimconv, str->string, &len);
 	ret->length = len;
     }

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    179,
 /**/
     178,
 /**/