applemedia: Fix build on iOS and probably also on OSX

The video toolbox is not available on iOS, and also on OSX
we should probably build all source files that are used for
it.

https://bugzilla.gnome.org/show_bug.cgi?id=722590

sys/applemedia/Makefile.am

@@ -89,7 +89,9 @@ else
 libgstapplemedia_la_SOURCES +=			\
 	qtkitvideosrc.m				\
 	vtenc.c 				\
-	vtdec.c
+	vtdec.c                                 \
+	vth264decbin.c				\
+	vth264encbin.c
 
 libgstapplemedia_la_LDFLAGS +=			\
 	-Wl,-framework -Wl,Cocoa		\

sys/applemedia/plugin.m

@@ -30,9 +30,11 @@
 #ifdef HAVE_AVFOUNDATION
 #include "avfvideosrc.h"
 #endif
+#ifndef HAVE_IOS
 #include "vth264decbin.h"
 #include "vth264encbin.h"
 #include "vtdec.h"
+#endif
 #include "atdec.h"
 
 #ifndef HAVE_IOS