Add PrimeCapture to zm_remote_camera_http. PrimeCapture is used to determine if we can connect and so by not implementing it, monitors like this say capturing even though they are not.

src/zm_remote_camera_http.cpp

@@ -1069,6 +1069,18 @@ int RemoteCameraHttp::GetResponse() {
   return( 0 );
 }
 
+int RemoteCameraHttp::PrimeCapture() {
+  if ( sd < 0 ) {
+    Connect();
+    if ( sd < 0 ) {
+      return -1;
+    }
+    mode = SINGLE_IMAGE;
+    buffer.clear();
+  }
+  return 0;
+}
+
 int RemoteCameraHttp::PreCapture() {
   if ( sd < 0 ) {
     Connect();

src/zm_remote_camera_http.h

@@ -55,6 +55,7 @@ public:
   int ReadData( Buffer &buffer, unsigned int bytes_expected=0 );
 	int GetData();
   int GetResponse();
+  int PrimeCapture();
   int PreCapture();
   int Capture( Image &image );
   int PostCapture();