Merge remote-tracking branch 'qatar/master'

* qatar/master:
  configure: Explicitly disable w32threads if the test for it fails
Merged-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -4337,7 +4337,8 @@ check_header X11/extensions/XvMClib.h
 check_header asm/types.h
 
 if ! disabled w32threads && ! enabled pthreads; then
-    check_func_headers "windows.h process.h" _beginthreadex && enable w32threads
+    check_func_headers "windows.h process.h" _beginthreadex &&
+        enable w32threads || disable w32threads
 fi
 
 # check for some common methods of building with pthread support