Merge #335: cmake: Fix builds configured with -DBUILD_KERNEL_LIB=ON

7243da5 fixup! cmake: Build `bitcoinkernel` library (Hennadii Stepanov)

Pull request description:

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Tree-SHA512: 9e9e1a1ef5c8c048554ef142b2255668fa551fb9fc86ad1cc21316730c0c24e63918b2e0763f0919cf8b18cfb77a1271c9aef2f519c5ce3c6cec566d7c4739dc

src/kernel/CMakeLists.txt

@@ -6,7 +6,7 @@
 #       library, as more and more modules are decoupled from the
 #       consensus engine, this list will shrink to only those
 #       which are absolutely necessary.
-add_library(bitcoinkernel EXCLUDE_FROM_ALL
+add_library(bitcoinkernel
   bitcoinkernel.cpp
   chain.cpp
   checks.cpp