erc fix: quote shell variables to prevent word splitting

bin/tools_ercat

@@ -17,17 +17,17 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 #
 
-PROGDIR=$(dirname $0)
+PROGDIR=$(dirname "$0")
 [ "$PROGDIR" = "." ] && PROGDIR=$(pwd)
 
 # will replaced to /usr/share/erc during install
-SHAREDIR=$(dirname $0)
+SHAREDIR=$(dirname "$0")
 
 load_helper()
 {
     local CMD="$SHAREDIR/$1"
     [ -r "$CMD" ] || fatal "Have no $CMD helper file"
-    . $CMD
+    . "$CMD"
 }
 
 load_helper erc-sh-functions