primitives: Use wildard re-export in locktimes

We recently decided to use wildcard re-exports when re-exporting things
from an identically named module in a sub crate, ie. to mirror the
directory structure structure ala core/std.

In the `primitives::locktime` modules re-export everything from the
`units::locktime` modules using a wildcard.

primitives/src/locktime/absolute.rs

@@ -17,9 +17,7 @@ use crate::absolute;
 
 #[rustfmt::skip]                // Keep public re-exports separate.
 #[doc(inline)]
-pub use units::locktime::absolute::{
-    Height, Time, LOCK_TIME_THRESHOLD, ConversionError, ParseHeightError, ParseTimeError,
-};
+pub use units::locktime::absolute::*;
 
 /// An absolute lock time value, representing either a block height or a UNIX timestamp (seconds
 /// since epoch).

primitives/src/locktime/relative.rs

@@ -18,7 +18,7 @@ use crate::Sequence;
 
 #[rustfmt::skip]                // Keep public re-exports separate.
 #[doc(inline)]
-pub use units::locktime::relative::{Height, Time, TimeOverflowError};
+pub use units::locktime::relative::*;
 
 /// A relative lock time value, representing either a block height or time (512 second intervals).
 ///