ci: Remove unparseable lines from supp file for old xenial clang tsan

ci/test/00_setup_env_native_tsan.sh

@@ -11,3 +11,7 @@ export PACKAGES="clang llvm python3-zmq qtbase5-dev qttools5-dev-tools libevent-
 export NO_DEPENDS=1
 export GOAL="install"
 export BITCOIN_CONFIG="--enable-zmq --disable-wallet --with-gui=qt5 CPPFLAGS='-DARENA_DEBUG -DDEBUG_LOCKORDER' --with-sanitizers=thread --disable-hardening --disable-asm CC=clang CXX=clang++"
+
+# xenial comes with old clang versions that can not parse the sanitizer suppressions files
+# Remove unparseable lines as a hacky workaround
+sed -i '/^implicit-/d' "${BASE_ROOT_DIR}/test/sanitizer_suppressions/ubsan"