cmake: add and use install_binary_component

Add a separate component for each binary for fine-grained installation options.

Also install the man pages for only for the targets enabled.

src/kernel/CMakeLists.txt

@@ -2,6 +2,8 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or https://opensource.org/license/mit/.
 
+include(GNUInstallDirs)
+
 # TODO: libbitcoinkernel is a work in progress consensus engine
 #       library, as more and more modules are decoupled from the
 #       consensus engine, this list will shrink to only those
@@ -130,7 +132,6 @@ endif()
 configure_file(${PROJECT_SOURCE_DIR}/libbitcoinkernel.pc.in ${PROJECT_BINARY_DIR}/libbitcoinkernel.pc @ONLY)
 install(FILES ${PROJECT_BINARY_DIR}/libbitcoinkernel.pc DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig" COMPONENT Kernel)
 
-include(GNUInstallDirs)
 install(TARGETS bitcoinkernel
   RUNTIME
     DESTINATION ${CMAKE_INSTALL_BINDIR}