patch 8.1.0808: MS-Windows: build error with GUI

Problem:    MS-Windows: build error with GUI.
Solution:   Remove "static".
diff --git a/src/gui_w32.c b/src/gui_w32.c
index 197c8f4..c5e5879 100644
--- a/src/gui_w32.c
+++ b/src/gui_w32.c
@@ -3552,7 +3552,7 @@
  *  initdir - directory in which to open the browser (NULL = current dir)
  *  filter  - Filter for matched files to choose from.
  */
-    static char_u *
+    char_u *
 gui_mch_browse(
 	int saving,
 	char_u *title,