Improve error reporting from build_*.sh scripts

Suppress the bogus errors from the "ls" command in AtlasExternals
GIve an explicit error message if error count is non-zero at end of scripts

Build/AtlasBuildScripts/build_Gaudi.sh

@@ -107,4 +107,8 @@ cpack || ((ERROR_COUNT++))
 mkdir -p ${RPMDIR} || ((ERROR_COUNT++))
 cp GAUDI*.rpm ${RPMDIR} || ((ERROR_COUNT++))
 
+if [ $ERROR_COUNT -ne 0 ]; then
+	echo "Gaudi build script counted $ERROR_COUNT errors"
+fi
+
 exit ${ERROR_COUNT}

Build/AtlasBuildScripts/build_atlasexternals.sh

@@ -98,7 +98,11 @@ fi
 # Build the RPM or other package for the project:
 cpack || ((ERROR_COUNT++))
 mkdir -p ${RPMDIR} || ((ERROR_COUNT++))
-FILES=$(ls ${PROJECT}*.rpm ${PROJECT}*.tar.gz ${PROJECT}*.dmg)
+FILES=$(ls ${PROJECT}*.rpm ${PROJECT}*.tar.gz ${PROJECT}*.dmg 2> /dev/null)
 cp ${FILES} ${RPMDIR} || ((ERROR_COUNT++))
 
+if [ $ERROR_COUNT -ne 0 ]; then
+	echo "AtlasExternals build script counted $ERROR_COUNT errors"
+fi
+
 exit ${ERROR_COUNT}