Move common functions declarations into header

renderdoccmd/renderdoccmd_apple.cpp

@@ -22,14 +22,12 @@
  * THE SOFTWARE.
  ******************************************************************************/
 
-#include <string>
-
+#include "renderdoccmd.h"
 #include <locale.h>
-#include <string.h>
-
-#include <unistd.h>
-
 #include <replay/renderdoc_replay.h>
+#include <string.h>
+#include <unistd.h>
+#include <string>
 
 using std::string;
 
@@ -41,12 +39,10 @@ string GetUsername()
   return string(buf, buf + strlen(buf));
 }
 
-void DisplayRendererPreview(ReplayRenderer *renderer, TextureDisplay displayCfg)
+void DisplayRendererPreview(ReplayRenderer *renderer, TextureDisplay &displayCfg)
 {
 }
 
-int renderdoccmd(int argc, char **argv);
-
 int main(int argc, char *argv[])
 {
   setlocale(LC_CTYPE, "");