IMPALA-11738: Add toolchain libstdc++ to LD_LIBRARY_PATH for HiveServer2

libfesupport.so is built against the toolchain libstdc++,
which may be newer than the OS libstdc++. Since HiveServer2
has libfesupport.so on its java.library.path, we should also
put the toolchain libstdc++ in LD_LIBRARY_PATH so that
libfesupport.so can resolve all its symbols properly.

This fixes an issue with a Hive crash in Ubuntu 18 dataload.

Testing:
 - Ran dataload on Ubuntu 18

Change-Id: Ib35e778850618b35073d102b89a4de02071b4a19
Reviewed-on: http://gerrit.cloudera.org:8080/19276
Reviewed-by: Joe McDonnell <joemcdonnell@cloudera.com>
Reviewed-by: Michael Smith <michael.smith@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>

testdata/bin/run-hive-server.sh

@@ -140,6 +140,11 @@ fi
 # Include the latest libfesupport.so in the JAVA_LIBRARY_PATH
 export JAVA_LIBRARY_PATH="${JAVA_LIBRARY_PATH-}:${IMPALA_HOME}/be/build/latest/service/"
 
+# Add the toolchain's libstdc++ to the LD_LIBRARY_PATH, because libfesupport.so may
+# need the newer version.
+GCC_HOME="${IMPALA_TOOLCHAIN_PACKAGES_HOME}/gcc-${IMPALA_GCC_VERSION}"
+export LD_LIBRARY_PATH="${LD_LIBRARY_PATH-}:${GCC_HOME}/lib64"
+
 export HIVESERVER2_HADOOP_OPTS="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,\
 suspend=n,address=30020"
 if [ ${START_HIVESERVER} -eq 1 ]; then