configure.ac: typo

configure.ac

@@ -1622,12 +1622,12 @@ dnl
 AC_ARG_ENABLE(screen,
   [  --enable-screen            Screen capture support (default enabled)])
 if test "${enable_screen}" != "no"; then
-  if test "${SYS}" == "darwin"; then
+  if test "${SYS}" = "darwin"; then
     AC_CHECK_HEADERS(ApplicationServices/ApplicationServices.h, [
       VLC_ADD_PLUGINS([screen])
       VLC_ADD_LDFLAGS([screen],[-framework ApplicationServices])
     ])
-  elif test "${SYS}" != "mingw32"; then
+  elif test "${SYS}" = "mingw32"; then
     VLC_ADD_PLUGINS([screen])
     VLC_ADD_LDFLAGS([screen],[-lgdi32])
   elif test "${SYS}" = "beos"; then