get_bits: Move BITSTREAM_READER_LE definition before all relevant #includes

This avoids the danger that get_bits.h might get indirectly #included before
BITSTREAM_READER_LE is defined.

Also sort headers into canonical order where appropriate.

libavcodec/tak_parser.c

@@ -24,8 +24,9 @@
  * TAK parser
  **/
 
-#include "tak.h"
+#define BITSTREAM_READER_LE
 #include "parser.h"
+#include "tak.h"
 
 typedef struct TAKParseContext {
     ParseContext  pc;