SF Tracker [ 1663004 ] Compile on Cygwin

Submitted By: Jon Foster - jongfoster
	This patch gives basic support for building under Cygwin - it compiles,
	links, and a simple UPnP device application can initialise. I'm not sure
	if it actually works yet, but this is definitely a step in the right
	direction.
	
	Patch is against the 1.4.1 release. Changes are:
	
	* threadutil/inc/ithread.h: Fix the ithread mutex support to use
	documented, portable APIs (if present) rather than the Non-Portable (_NP)
	ones it uses now. This is required because Cygwin implements only the
	portable API.
	
	* threadutil/src/ThreadPool.c: Fake SetPolicyType() to do nothing on Cygwin
	because otherwise it fails. Should probably investigate why it fails and
	add a proper implementation later.
	
	* upnp/src/api/upnpapi.c: On Cygwin, zero out the GlobalHndMutex structure
	before initialising it. Without this, the initialisation fails. This
	appears to be a bug in Cygwin.
	
	* upnp/src/genlib/net/uri/uri.c: Use gethostbyname() on Cygwin.



git-svn-id: https://pupnp.svn.sourceforge.net/svnroot/pupnp/trunk@151 119443c7-1b9e-41f8-b6fc-b9c35fce742c

upnp/src/genlib/net/uri/uri.c

@@ -611,7 +611,9 @@ parse_hostport( const char *in,
         int errCode = 0;
 
         //call gethostbyname_r (reentrant form of gethostbyname)
-#if defined(WIN32)
+        // TODO: Use autoconf to discover this rather than the
+        // platform-specific stuff below
+#if defined(WIN32) || defined(__CYGWIN__)
         h=gethostbyname(temp_host_name);
 #elif defined(SPARC_SOLARIS)
         errCode = gethostbyname_r( temp_host_name,