configure: Use a separate config_components.h header for $ALL_COMPONENTS

This avoids unnecessary rebuilds of most source files if only the
list of enabled components has changed, but not the other properties
of the build, set in config.h.

Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/avienc.c

@@ -25,6 +25,7 @@
 #include "internal.h"
 #include "avi.h"
 #include "avio_internal.h"
+#include "config_components.h"
 #include "riff.h"
 #include "mpegts.h"
 #include "libavformat/avlanguage.h"