ci: Build bitcoin-chainstate

...to make sure that the linker errors that arise from coupling
regressions are caught by CI.

Adding to the "no wallet" ci job as suggested by MarcoFalke.

.cirrus.yml

@@ -259,13 +259,13 @@ task:
     FILE_ENV: "./ci/test/00_setup_env_i686_multiprocess.sh"
 
 task:
-  name: '[no wallet] [bionic]'
+  name: '[no wallet, libbitcoinkernel] [bionic]'
   << : *GLOBAL_TASK_TEMPLATE
   container:
     image: ubuntu:bionic
   env:
     << : *CIRRUS_EPHEMERAL_WORKER_TEMPLATE_ENV
-    FILE_ENV: "./ci/test/00_setup_env_native_nowallet.sh"
+    FILE_ENV: "./ci/test/00_setup_env_native_nowallet_libbitcoinkernel.sh"
 
 task:
   name: 'macOS 10.15 [gui, no tests] [focal]'

ci/test/00_setup_env_native_nowallet_libbitcoinkernel.sh

@@ -6,9 +6,9 @@
 
 export LC_ALL=C.UTF-8
 
-export CONTAINER_NAME=ci_native_nowallet
+export CONTAINER_NAME=ci_native_nowallet_libbitcoinkernel
 export DOCKER_NAME_TAG=ubuntu:18.04  # Use bionic to have one config run the tests in python3.6, see doc/dependencies.md
 export PACKAGES="python3-zmq clang-7 llvm-7 libc++abi-7-dev libc++-7-dev"  # Use clang-7 to test C++17 compatibility, see doc/dependencies.md
 export DEP_OPTS="NO_WALLET=1 CC=clang-7 CXX='clang++-7 -stdlib=libc++'"
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-reduce-exports CC=clang-7 CXX='clang++-7 -stdlib=libc++'"
+export BITCOIN_CONFIG="--enable-reduce-exports CC=clang-7 CXX='clang++-7 -stdlib=libc++' --enable-experimental-util-chainstate"

src/Makefile.am

@@ -853,6 +853,10 @@ bitcoin_chainstate_LDADD = \
   $(LIBLEVELDB) \
   $(LIBLEVELDB_SSE42) \
   $(LIBMEMENV)
+
+# Required for obj/build.h to be generated first.
+# More details: https://www.gnu.org/software/automake/manual/html_node/Built-Sources-Example.html
+bitcoin_chainstate-clientversion.$(OBJEXT): obj/build.h
 #
 
 # bitcoinconsensus library #