Merge bitcoin#24522: ci: remove compiled-but-unused BDB from MSAN job

3566353 ci: remove compiled-but-unused BDB from MSAN job (fanquake)

Pull request description:

  Self-compiled BDB was added to this job as opposed to using depends BDB [due to linking issues](bitcoin#18288 (comment)), however the compiled BDB is not actually used. Remove it for now, given we don't actually lose any coverage (note that BDB is also not currently used in the naitve MSAN fuzz job or for [OSS Fuzz](https://github.com/google/oss-fuzz/blob/master/projects/bitcoin-core/build.sh#L32) builds).

  In future, we can use depends BDB, however introducing it now will cause false positives, which can be fixed by upgrading the versions of Clang / LLVM we use, however upgrading to those newer versions causes other issues, which appear in standard library code, and require more involved suppressing, which can be solved in a follow up or another PR i.e bitcoin#23008.

Top commit has no ACKs.

Tree-SHA512: 9e8fdd95246cafa27cda7bcf0641b428d4573f6748ecdf07cc6205a64351db22ba383ec943e88a69df3694ccb9f125d994b64345a4e44fb6fea4a014504760d1

Author: MarcoFalke

ci/test/00_setup_env_native_msan.sh

@@ -11,13 +11,12 @@ LIBCXX_DIR="${BASE_SCRATCH_DIR}/msan/build/"
 export MSAN_FLAGS="-fsanitize=memory -fsanitize-memory-track-origins=2 -fno-omit-frame-pointer -g -O1 -fno-optimize-sibling-calls"
 LIBCXX_FLAGS="-nostdinc++ -stdlib=libc++ -L${LIBCXX_DIR}lib -lc++abi -I${LIBCXX_DIR}include -I${LIBCXX_DIR}include/c++/v1 -lpthread -Wl,-rpath,${LIBCXX_DIR}lib -Wno-unused-command-line-argument"
 export MSAN_AND_LIBCXX_FLAGS="${MSAN_FLAGS} ${LIBCXX_FLAGS}"
-export BDB_PREFIX="${BASE_ROOT_DIR}/db4"
 
 export CONTAINER_NAME="ci_native_msan"
 export PACKAGES="clang-9 llvm-9 cmake"
 export DEP_OPTS="NO_BDB=1 NO_QT=1 CC='clang' CXX='clang++' CFLAGS='${MSAN_FLAGS}' CXXFLAGS='${MSAN_AND_LIBCXX_FLAGS}' libevent_cflags='${MSAN_FLAGS}' sqlite_cflags='${MSAN_FLAGS}' zeromq_cxxflags='-std=c++17 ${MSAN_AND_LIBCXX_FLAGS}'"
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-wallet --with-sanitizers=memory --with-asm=no --prefix=${DEPENDS_DIR}/x86_64-pc-linux-gnu/ CC=clang CXX=clang++ CFLAGS='${MSAN_FLAGS}' CXXFLAGS='${MSAN_AND_LIBCXX_FLAGS}' BDB_LIBS='-L${BDB_PREFIX}/lib -ldb_cxx-4.8' BDB_CFLAGS='-I${BDB_PREFIX}/include'"
+export BITCOIN_CONFIG="--enable-wallet --with-sanitizers=memory --with-asm=no --prefix=${DEPENDS_DIR}/x86_64-pc-linux-gnu/ CC=clang CXX=clang++ CFLAGS='${MSAN_FLAGS}' CXXFLAGS='${MSAN_AND_LIBCXX_FLAGS}'"
 export USE_MEMORY_SANITIZER="true"
 export RUN_FUNCTIONAL_TESTS="false"
 export CCACHE_SIZE=250M

ci/test/05_before_script.sh

@@ -36,13 +36,6 @@ if [ -n "$ANDROID_HOME" ] && [ ! -d "$ANDROID_HOME" ]; then
   CI_EXEC "yes | ${ANDROID_HOME}/cmdline-tools/tools/bin/sdkmanager --install \"build-tools;${ANDROID_BUILD_TOOLS_VERSION}\" \"platform-tools\" \"platforms;android-${ANDROID_API_LEVEL}\" \"ndk;${ANDROID_NDK_VERSION}\""
 fi
 
-if [[ ${USE_MEMORY_SANITIZER} == "true" ]]; then
-  # Use BDB compiled using install_db4.sh script to work around linking issue when using BDB
-  # from depends. See https://github.com/bitcoin/bitcoin/pull/18288#discussion_r433189350 for
-  # details.
-  CI_EXEC "contrib/install_db4.sh \$(pwd) --enable-umrw CC=clang CXX=clang++ CFLAGS='${MSAN_FLAGS}' CXXFLAGS='${MSAN_AND_LIBCXX_FLAGS}'"
-fi
-
 if [ -z "$NO_DEPENDS" ]; then
   if [[ $DOCKER_NAME_TAG == *centos* ]]; then
     # CentOS has problems building the depends if the config shell is not explicitly set