message catalogs: fix comment lines, also remove linux hack in merge.c

According to the spec, blank lines in message catalogs or lines
beginning with '$ ' are valid comments.

However, there were many cases where lines in the message catalogs
contained just a single '$', without the required space after it.

Under linux, this caused 126766 error lines (in my builds) of the
form:

... unknown directive `': line ignored

This also causes gencat to exit with a non-0 exit code.  Even though
gencat says it ignores the line, it really doesn't.

An early porting change to programs/localized/util/merge.c was made to
ignore this return value on linux.  This hack has now been removed.

Build logs are a lot smaller and cleaner now.

cde/programs/localized/sv_SE.ISO8859-1/msg/dtconfig.msg

@@ -20,31 +20,31 @@ $ *****************************************************************************
 
 $set 10
 1 can only be run by the super user. \n
-$
+$ 
 2 The CDE environment is now set as the default user interface. This\n\
 interface will appear on login for all users of the system.\n\
 To see this change take effect you must shutdown and restart your system.\n
-$
+$ 
 3 The Command line is now set as the default user interface. This\n\
 interface will appear on login for all users of the system.\n\
 To see this change take effect you must shutdown and restart your system.\n
 4 The CDE environment is Already set as the default User Interface.\n
-$
+$ 
 5 The Command line is already set as the default User Interface.\n
-$
+$ 
 6 usage: %s\n\
   -e (enable auto-start of dtlogin)\n\
   -d (disable auto-start of dtlogin)\n\
   -kill (kill dtlogin)\n\
   -reset (reset dtlogin - reread configuration files)\n
-$
+$ 
 7 Too many arguments \n
-$
+$ 
 8  Needs one argument \n
-$
+$ 
 9  Could not disable xdm, Please refer to xdm man pages to disable\n\
 xdm and try again. \n 
-$
+$ 
 10 Dtlogin is not running \n
 
 $ *****************************************************************************
@@ -52,18 +52,18 @@ $ **  Message set 20: For Sun Platforms
 $ *****************************************************************************
 
 $set 20
-$
+$ 
 1  CDE configuration utility
-$
+$ 
 2   %s -d     (disable auto-start)
 3   %s -e     (enable auto-start)
 4   %s -kill  (kill dtlogin)
 5   %s -reset (reset dtlogin)
 6   %s -p     (printer action update)
-$
+$ 
 $	In above messages 2 through 6, only translate words between
 $	left "(" and right ").
-$
+$ 
 7 %s: this script must be run as root
 8 Usage: Too many arguments
 9 Usage: Needs one argument