utils: remove bashisms

fbsetbg: The random number generation used 'time' shell internal, which
does not exist in all shells.  Allowing 'ps' output to be part of cksum
input will increase entropy and enhance quality of the randomness.

fbsetbg: The second fix is more important.  In posix shell there is no
'==' comparision operator.

fluxbox-generate_menu: There are no quarantees about echo accepting
options, so use 'printf' for more advanced outputing.

util/fbsetbg

@@ -505,7 +505,11 @@ if [ "$option" = random ]; then
             randomnumber=`random_number`
         # some shells don't support $RANDOM
         elif [ -z "$RANDOM" ]; then
-            randomnumber=`(echo $$ ;time ps; w ; date )2>&1 | cksum | cut -f1 -d' '`
+            if [ -r /dev/urandom ]; then
+                randomnumber=`hexdump -n 2 -e '/2 "%u"' /dev/urandom`
+            else
+                randomnumber=`(echo $$; ps; w; date) 2>&1 | cksum | cut -f1 -d' '`
+            fi
         else
             randomnumber="$RANDOM"
         fi
@@ -526,7 +530,7 @@ fi
 
 
 if [ ! -r "$wallpaper" ]; then
-	if [ "$ignore_missing_wallpaper" == "true" ]; then
+	if [ "$ignore_missing_wallpaper" = "true" ]; then
 		exit 0
 	fi
     message "Can't find wallpaper $wallpaper"

util/fluxbox-generate_menu.in

@@ -331,7 +331,7 @@ searchForIcon(){
     if [ -f "$entry_icon" ]; then
     # if icon exists and entry does not already exists, add it
         if ! grep -q -m 1 "^.${entry_exec}.[[:space:]]*<.*/${icon_base}\....>" $ICONMAPPING 2> /dev/null; then
-            echo -e "\"${entry_exec}\" \t <${entry_icon}>" >> $ICONMAPPING
+            printf "\"${entry_exec}\" \t <${entry_icon}>\n" >> $ICONMAPPING
         else 
             : echo "#    mapping already exists for ${entry_exec}" >> $ICONMAPPING
         fi