win{32,64}: Hard disable symbol versioning

ICL doesn't return an error on unknown parameters, and will
always pass the symver_gnu_asm test, and since Windows
never has symbol versioning, just always disable it.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

configure

@@ -3222,6 +3222,7 @@ case $target_os in
         enable dos_paths
         ;;
     win32|win64)
+        disable symver
         if enabled shared; then
             # Link to the import library instead of the normal static library
             # for shared libs.