Solve minor problem with compiling OMX related things on Mac

src/Sources/OMXPlayerCache.cpp

@@ -1,5 +1,7 @@
 #include "OMXPlayerCache.h"
 
+#ifdef TARGET_RASPBERRY_PI
+
 namespace ofx {
 namespace piMapper {
 
@@ -40,3 +42,5 @@ void OMXPlayerCache::unload(string moviePath){
 
 } // namespace piMapper
 } // namespace ofx
+
+#endif

src/Sources/OMXPlayerCache.h

@@ -1,9 +1,12 @@
 #pragma once
 
+#ifdef TARGET_RASPBERRY_PI
+
 #include "ofMain.h"
 #include "ofxOMXPlayer.h"
 #include "VideoSource.h"
 
+
 namespace ofx {
 namespace piMapper {
 
@@ -22,3 +25,5 @@ class OMXPlayerCache {
 
 } // namespace piMapper
 } // namespace ofx
+
+#endif