build: move pow and chain to bitcoin_common

The next commit needs pow.cpp in rpc/util.cpp.

src/CMakeLists.txt

@@ -109,6 +109,7 @@ add_library(bitcoin_common STATIC EXCLUDE_FROM_ALL
   addresstype.cpp
   base58.cpp
   bech32.cpp
+  chain.cpp
   chainparams.cpp
   chainparamsbase.cpp
   coins.cpp
@@ -142,6 +143,7 @@ add_library(bitcoin_common STATIC EXCLUDE_FROM_ALL
   outputtype.cpp
   policy/feerate.cpp
   policy/policy.cpp
+  pow.cpp
   protocol.cpp
   psbt.cpp
   rpc/external_signer.cpp
@@ -200,7 +202,6 @@ add_library(bitcoin_node STATIC EXCLUDE_FROM_ALL
   bip324.cpp
   blockencodings.cpp
   blockfilter.cpp
-  chain.cpp
   consensus/tx_verify.cpp
   dbwrapper.cpp
   deploymentstatus.cpp
@@ -262,7 +263,6 @@ add_library(bitcoin_node STATIC EXCLUDE_FROM_ALL
   policy/rbf.cpp
   policy/settings.cpp
   policy/truc_policy.cpp
-  pow.cpp
   rest.cpp
   rpc/blockchain.cpp
   rpc/fees.cpp