File boost-thread.patch of Package mingw32-boost

--- a/boost/config/compiler/gcc.hpp	2017-04-17 04:22:19.000000000 +0200
+++ b/boost/config/compiler/gcc.hpp	2017-05-31 07:50:36.540165131 +0200
@@ -73,7 +73,7 @@
 // those platforms where we can know for sure). It will get turned off again
 // later if no threading API is detected.
 //
-#if !defined(__MINGW32__) && !defined(linux) && !defined(__linux) && !defined(__linux__)
+#if !defined(__MINGW32__) 
 # define BOOST_HAS_THREADS
 #endif