Fix building Windows alongside Android Studio

Windows: resolve missing reference to _SC_OPEN_MAX

https://lists.gnu.org/archive/html/bug-gnulib/2014-08/msg00023.html
https://libwebsockets.org/lws-api-doc-master/html/libwebsockets_8h_source.html

Windows: comment duplicate x86_ptr_imm definition

Replaced by more explicit type definitions. Fixes x64 compile

Restore secondary x86_ptr_imm for non-Windows

This appears to be a necessary duplicate for other platforms.

core/deps/libwebsocket/context.c

@@ -25,6 +25,10 @@
 #define LWS_BUILD_HASH "unknown-build-hash"
 #endif
 
+#ifdef WIN32
+#define getdtablesize() 30000
+#endif
+
 static const char *library_version = LWS_LIBRARY_VERSION " " LWS_BUILD_HASH;
 
 /**
@@ -122,7 +126,11 @@ libwebsocket_create_context(struct lws_context_creation_info *info)
 	context->options = info->options;
 	context->iface = info->iface;
 	/* to reduce this allocation, */
+#ifdef WIN32
+	context->max_fds = getdtablesize ();
+#else
 	context->max_fds = sysconf(_SC_OPEN_MAX);
+#endif
 	lwsl_notice(" static allocation: %u + (%u x %u fds) = %u bytes\n",
 		sizeof(struct libwebsocket_context),
 		sizeof(struct libwebsocket_pollfd) +

core/emitter/x86_emitter.h

@@ -229,11 +229,13 @@ struct /*__declspec(dllexport)*/  x86_ptr_imm
 		this->ptr=ptr;
 	}
 
+#ifndef WIN32
 	template<typename Rv, typename ...Args>
 	x86_ptr_imm(Rv(* ptr)(Args...))
 	{
 		this->ptr= reinterpret_cast<void*>(ptr);
 	}
+#endif
 
     template<typename Rv, typename ...Args>
     x86_ptr_imm(Rv(DYNACALL * ptr)(Args...))