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/segment.c

@@ -24,6 +24,8 @@
  * @url{http://tools.ietf.org/id/draft-pantos-http-live-streaming}
  */
 
+#include "config_components.h"
+
 #include <float.h>
 #include <time.h>