video_mixer: fix build for non-x86

Change-Id: Id5701d472415fe68685c3d8126566b93443810bb
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3988
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

src/add-ons/media/media-add-ons/video_mixer/CpuCapabilities.cpp

@@ -26,6 +26,8 @@ CPUCapabilities::CPUCapabilities()
 	PrintCapabilities();
 }
 
+#ifdef __i386__
+
 void
 CPUCapabilities::setIntelCapabilities()
 {
@@ -85,6 +87,8 @@ CPUCapabilities::setIntelCapabilities()
 	}
 }
 
+#endif
+
 bool
 CPUCapabilities::HasMMX()
 {

src/add-ons/media/media-add-ons/video_mixer/CpuCapabilities.h

@@ -33,8 +33,10 @@ class CPUCapabilities {
 	
 	private:
 		uint32		capabilities;
-	
+
+#ifdef __i386__
 		void setIntelCapabilities();
+#endif
 };
 
 #endif	//__CPU_CAPABILITIES__