Merge bitcoin#30802: doc: Clarify libbitcoin_consensus in design/libraries.md

fa78ed8 doc: Clarify libbitcoin_consensus in design/libraries.md (MarcoFalke)

Pull request description:

  Now that the shared library has been removed in commit 80f8b92, update the documentation to drop the no-longer applicable prefix "Stable...".

ACKs for top commit:
  hebasto:
    ACK fa78ed8.
  fanquake:
    ACK fa78ed8

Tree-SHA512: d7b946d50f734c0474ff6155a655a2bb873f76e071bfeeca1dd42ea5fdd32bc1e45129826bb54e3f111265d19c2aba2d02cb77ad7663f9fc40c8c875e5fddda2

Author: fanquake

doc/design/libraries.md

@@ -4,7 +4,7 @@
 |--------------------------|-------------|
 | *libbitcoin_cli*         | RPC client functionality used by *bitcoin-cli* executable |
 | *libbitcoin_common*      | Home for common functionality shared by different executables and libraries. Similar to *libbitcoin_util*, but higher-level (see [Dependencies](#dependencies)). |
-| *libbitcoin_consensus*   | Stable, backwards-compatible consensus functionality used by *libbitcoin_node* and *libbitcoin_wallet*. |
+| *libbitcoin_consensus*   | Consensus functionality used by *libbitcoin_node* and *libbitcoin_wallet*. |
 | *libbitcoin_crypto*      | Hardware-optimized functions for data encryption, hashing, message authentication, and key derivation. |
 | *libbitcoin_kernel*      | Consensus engine and support library used for validation by *libbitcoin_node*. |
 | *libbitcoinqt*           | GUI functionality used by *bitcoin-qt* and *bitcoin-gui* executables. |

src/CMakeLists.txt

@@ -75,7 +75,6 @@ add_subdirectory(secp256k1)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 string(APPEND CMAKE_C_COMPILE_OBJECT " ${APPEND_CPPFLAGS} ${APPEND_CFLAGS}")
 
-# Stable, backwards-compatible consensus functionality.
 add_library(bitcoin_consensus STATIC EXCLUDE_FROM_ALL
   arith_uint256.cpp
   consensus/merkle.cpp