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/it_IT.ISO8859-1/msg/dtinfo_start.msg

@@ -1,5 +1,5 @@
 $ $TOG: dtinfo_start.msg /main/3 1999/09/20 13:29:26 mgreess $
-$
+$ 
 $ (c) Copyright 1996 Digital Equipment Corporation.
 $ (c) Copyright 1996 Hewlett-Packard Company.
 $ (c) Copyright 1996 International Business Machines Corp.
@@ -7,26 +7,26 @@ $ (c) Copyright 1996 Sun Microsystems, Inc.
 $ (c) Copyright 1996 Novell, Inc. 
 $ (c) Copyright 1996 FUJITSU LIMITED.
 $ (c) Copyright 1996 Hitachi.
-$
+$ 
 $ ******************************************************************************
-$
+$ 
 $set 1
 $ The messages in this set will only appear in the users
 $   "errorlog" file.
-$
+$ 
 $ ******************************************************************************
-$
+$ 
 $ Messages 1-5: These messages result from an error in a tt_* function
 $    call.
-$
+$ 
 1 The ttsession(1) process is not running and the ToolTalk\n\
 service cannot restart it.
 2 The current default process identifier is out of date or invalid.
 3 The specified ToolTalk session is out of date or invalid.
 
-$
+$ 
 $ Message 4: Do not localize the word DtInfo_Start.
-$
+$ 
 4 The process type 'DtInfo_Start' is not the\n\
 name of an installed process type.
 
@@ -34,36 +34,36 @@ name of an installed process type.
 
 6 Cannot invoke an action because malloc(1) failed.
 
-$
+$ 
 $ Message 7: Do not localize the word DISPLAY.  Do not localize the
 $   word XtOpenDisplay().
-$
+$ 
 7 XtOpenDisplay() failed.  Perhaps the DISPLAY environment\n\
 variable is not set or is invalid.
 
-$
+$ 
 $ Message 8: Do not localize the word DtAppInitialize().
-$
+$ 
 8 DtAppInitialize() failed.  Perhaps the desktop environment\n\
 is not properly installed.
 
-$
+$ 
 $ Message 9: Do NOT localize the word DTINFOLIBDEFAULT
-$
+$ 
 9 An InfoLib was not provided in the '%s' message.\n\
 The value of the environment variable DTINFOLIBDEFAULT\n\
 (%s) will be used for the InfoLib.
 
-$
+$ 
 $ Message 10: Do NOT localize the word DTINFOLIBDEFAULT
-$
+$ 
 10 An InfoLib was not provided in the '%s' message\n\
 and the environment variable DTINFOLIBDEFAULT was not defined.
 
-$
+$ 
 $ Messages 11-16: These message are the result of the dtinfo_start
 $   getting an error while trying to parse a ToolTalk message.
-$
+$ 
 $   Do NOT localize the word NULL
 $   
 11 The message operation '%d' is not supported.