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/C/app-defaults/Dtimsstart.tmsg

@@ -22,107 +22,107 @@ $ *                         \ (at end of line)  continue on same line
 $ *
 $ *****************************************************************************
 $ ----------------------------------------------------------------------------
-$
+$ 
 $ font list
 1 -dt-interface user-medium-r-normal-m*-*-*-*-*-m-*:
-$
+$ 
 $ title bar title
 2 dtimsstart
-$
+$ 
 $ Selection title
 3 Input Method Selection
-$
+$ 
 $ Host title
 4 Change Host
-$
+$ 
 $ Mode title
 5 Input Method Selection Mode
-$
+$ 
 $ OK button label
 6 OK
-$
+$ 
 $ Clear button label
 7 Clear
-$
+$ 
 $ Cancel button label
 8 Cancel
-$
+$ 
 $ Change Host button label
 9 Change Host
-$
+$ 
 $ Help button label
 10 Help
-$
+$ 
 $ selection dialog border width
 11 3
-$
+$ 
 $ host dialog border width
 12 3
-$
+$ 
 $ XmDialogShell border width
 13 0
-$
+$ 
 $ cmd_rc default spacing (margin width)
 14 10
-$
+$ 
 $ cmd_rc default spacing 
 15 10
-$
+$ 
 $ Selection dialog cmd_rc (margin width)
 16 4
-$
+$ 
 $ Selection dialog OK margin width
 17 16
-$
+$ 
 $ Selection dialog cmd_rc default spacing 
 18 40
-$
+$ 
 $ Change Host dialog label
 19 Hostname:
-$
+$ 
 $ 
 20 XmALIGNMENT_BEGINNING
-$
-$
+$ 
+$ 
 21 20
-$
-$
+$ 
+$ 
 22 20
-$
-$
+$ 
+$ 
 23  \
 Enter the hostname where the registered\\n \
 input method servers should be shown.\\n \
 Empty hostname indicates the local host.
-$
-$
+$ 
+$ 
 24 63
-$
-$
+$ 
+$ 
 25 14
-$
-$
+$ 
+$ 
 26 60
-$
-$
+$ 
+$ 
 27 20
-$
-$
+$ 
+$ 
 28 90
-$
-$
+$ 
+$ 
 29 Ask at login
-$
-$
+$ 
+$ 
 30 Resume current input method
-$
-$
+$ 
+$ 
 31 50
-$
-$
+$ 
+$ 
 32 20
-$
-$
+$ 
+$ 
 33 \\n \
         Input Method Selection\\n \
 \\n \
@@ -148,8 +148,8 @@ $
         one without any window operation.  To do so, execute the action\\n \
         'DtImsMode', located at Desktop_Tools in Application Manager,\\n \
         and select 'Resume current input method' on the dialog window.\\n
-$
-$
+$ 
+$ 
 34 \\n \
         Input Method Selection Mode\\n \
 \\n \
@@ -169,5 +169,5 @@ $
       [Cancel]:    discards the changes and closes the window.\\n \
 \\n \
       [Help]:      shows this message.\\n
-$
-$
+$ 
+$