patch 8.1.0483: MinGW does not build tee.exe

Problem:    MinGW does not build tee.exe.
Solution:   Add build instructions. (Yasuhiro Matsumoto, closes #3548)
diff --git a/src/version.c b/src/version.c
index 09334c4..2c7550d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    483,
+/**/
     482,
 /**/
     481,