Reorganise ECC code for inclusion in FIPS module.

Move compression, point2oct and oct2point functions into separate files.

Add a flags field to EC_METHOD.

Add a flag EC_FLAGS_DEFAULT_OCT to use the default compession and oct
functions (all existing methods do this). This removes dependencies from
EC_METHOD while keeping original functionality.

crypto/ec/ec_curve.c

@@ -69,6 +69,8 @@
  *
  */
 
+#define OPENSSL_FIPSAPI
+
 #include "ec_lcl.h"
 #include <openssl/err.h>
 #include <openssl/obj_mac.h>