winex11.drv: Write-strings warning fix

[Andrew Talbot]

Changelog:
    winex11.drv: Write-strings warning fix.

diff -urN a/dlls/winex11.drv/window.c b/dlls/winex11.drv/window.c
--- a/dlls/winex11.drv/window.c	2006-06-16 14:19:17.000000000 +0100
+++ b/dlls/winex11.drv/window.c	2006-06-26 20:37:10.000000000 +0100
@@ -411,8 +411,10 @@
     /* class hints */
     if ((class_hints = XAllocClassHint()))
     {
+        char wine[] = "Wine";
+
         class_hints->res_name = process_name;
-        class_hints->res_class = "Wine";
+        class_hints->res_class = wine;
         XSetClassHint( display, data->whole_window, class_hints );
         XFree( class_hints );
     }