quoted string for sourcing ost_config

Without the quotes the scripts don't work if there is a directory
with spaces in the binary path.

scripts/dng.in

@@ -26,6 +26,6 @@ else
   SCRIPT_NAME="$0"
 fi
 BIN_DIR=`dirname "$SCRIPT_NAME"`
-source $BIN_DIR/../@LIBEXEC_PATH@/ost_config
+source "$BIN_DIR/../@LIBEXEC_PATH@/ost_config"
 
 $BIN_DIR/../@LIBEXEC_PATH@/gosty $DNG_INITDIR/init.py dng $opts

scripts/ost.in

@@ -29,7 +29,7 @@ else
 fi
 BIN_DIR=`dirname "$SCRIPT_NAME"`
 
-source $BIN_DIR/../@LIBEXEC_PATH@/ost_config
+source "$BIN_DIR/../@LIBEXEC_PATH@/ost_config"
 
 $pyexec $interactive "$DNG_ROOT/@LIBDIR@/python@PYTHON_VERSION@/site-packages/init_cl.py" $opts
 RC=$?