WIP: libbitcoinsv2 C header API

Standalone library with Stratum v2 functionality.

TODO: ?

CMakeLists.txt

@@ -171,6 +171,8 @@ endif()
 
 option(WITH_SV2 "Enable Stratum v2 functionality." ON)
 
+option(BUILD_SV2_LIB "Build experimental bitcoinsv2 library." OFF)
+
 cmake_dependent_option(BUILD_GUI_TESTS "Build test_bitcoin-qt executable." ON "BUILD_GUI;BUILD_TESTS" OFF)
 if(BUILD_GUI)
   set(qt_components Core Gui Widgets LinguistTools)
@@ -627,6 +629,7 @@ message("  USDT tracing ........................ ${WITH_USDT}")
 message("  QR code (GUI) ....................... ${WITH_QRENCODE}")
 message("  DBus (GUI, Linux only) .............. ${WITH_DBUS}")
 message("  Stratum v2 .......................... ${WITH_SV2}")
+message("  libbitcoinsv2 (experimental) ........ ${BUILD_SV2_LIB}")
 message("Tests:")
 message("  test_bitcoin ........................ ${BUILD_TESTS}")
 message("  test_bitcoin-qt ..................... ${BUILD_GUI_TESTS}")