inserted missing back quotes around echo lost by previous change

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41977 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

distrib/scripts/create_archives.sh

@@ -116,15 +116,17 @@ dospinport(){
     
     case "$port" in
         all)
-          portname=Widgets;;
+            portname="Widgets";;
         base)
-          portname=Base;;
+            portname="Base";;
         motif)
-          portname=Motif;;
+            portname="Motif";;
         mac)
-          portname=Mac;;
+            portname="Mac";;
         *)
-          portname=echo $port | tr [a-z] [A-Z];;
+            # for all the others (DFB, GTK, MGL, MSW, X11) just use the
+            # upper-case version as they are abbreviations
+            portname=`echo $port | tr '[a-z]' '[A-Z]'`;;
     esac
     
     echo "Creating wx$portname distribution..."