patch 9.0.1901: win32: not correctly freeing environment

Problem:  win32: not correctly freeing environment
Solution: After we call GetEnvironmentStringsW, we should call
          FreeEnvironmentStringsW

closes: #13096
closes: #13094

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Ken Takata <kentkt@csc.jp>
diff --git a/src/version.c b/src/version.c
index edfd635..a0e6156 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1901,
+/**/
     1900,
 /**/
     1899,