File build-on-windows.patch of Package mingw64-opensp

--- a/configure.in	2016-10-18 08:52:46.533006676 +0000
+++ b/configure.in	2016-10-18 09:05:27.092542547 +0000
@@ -56,6 +56,12 @@
 
 AH_TEMPLATE([SIZEOF_WCHAR_T],[size of wchar_t])
 
+if test "$host_alias" = "i686-w64-mingw32" || test "$host_alias" = "x86_64-w64-mingw32"
+then
+	AC_DEFINE(WINSOCK, "1", [Winsock])
+	AM_CONDITIONAL(SP_WIN32, true)
+	LIBS="$LIBS -lws2_32"
+fi
 AH_BOTTOM([
 #ifdef HAVE_UNISTD_H
 #define SP_INCLUDE_UNISTD_H