Pmodules/modulecmd

- quote argument for dirname(1)
- do NOT use 'declare -r' the variable 'bindir' (not all
  bourne-compatible shells are supporting this keyword)

Pmodules/modulecmd

@@ -2,5 +2,5 @@
 
 unset BASH_ENV
 
-declare -r bindir=$( cd $(dirname $0) && pwd -P )
+bindir=$( cd $(dirname "$0") && pwd -P )
 "${bindir}/bash" --noprofile --norc "${bindir}/../libexec/modulecmd.bash" "$@"