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/dtwm/dtwm.msg

@@ -215,7 +215,7 @@ $        "PackIcons" and the "P" should be localized unless the
 $        accelerator interferes with the local keyboard.  
 $        The accelerator is OSF standard for this item and should only be
 $        changed if this accelerator would lock out a local key use.
-$
+$ 
 $        The underbar
 $        is part of the syntax for mnemonics and should not be changed.
 $        The letter after the underbar should match a letter (case sensitive)
@@ -223,7 +223,7 @@ $        in the item title .
 $        (e.g.   CompressIcons _C Alt Shift<Key>F7 f.pack_icons\n  
 $          OR
 $                CompressIcons _I Alt Shift<Key>F7 f.pack_icons\n  )         
-$
+$ 
 $   The mnemonic should also be chosen such such that it does not 
 $        conflict with another mnemonic in the menu.
 
@@ -388,12 +388,12 @@ $set 60
 $    THIS COMMENT FOR DTWM TEAM ONLY -- WmResParse.c --
 $    Messages 1-39 and 41-42 are written to an error file.
 $    YOU DO NOT NEED TO LOCALIZE MESSAGES 1-39, 41-42.
-$
+$ 
 $    Message 40 allows you to alter the labels for the modifier
 $    keys on the menu accelerators. You may wish to localize
 $    message 40 so that these labels match the keycaps on your
 $    local keyboard.
-$
+$ 
 1 Insufficient memory for session geometry item
 2 Insufficient memory for workspaces list in sesssion item
 3 Insufficient memory for commandArgv array
@@ -440,17 +440,17 @@ $ modifier key labels to the keycaps that the user sees on the
 $ local keyboard. If modifier key labels are not remapped, then
 $ the key label used in the accelerator spec will appear on
 $ the menu
-$
+$ 
 $ Example: menu spec in dtwmrc file
 $ 	 "Close"                 _C   Alt<Key>F4      f.kill
-$
+$ 
 $ Appears as
 $         Close       Alt+F4
 $         -                  (the 'C' in Close is underlined)
-$
+$ 
 $ if message 40 doesn't remap "Alt" then accelerator text is "Alt+F4"
 $ if message 40 is "Alt XYZ" then accelerator text is "XYZ+F4"
-$
+$ 
 $ The format of this message is a sequence of strings separated
 $ by spaces. The strings are taken in pairs. If the first string
 $ in a pair matches a accelerator key label, the second string
@@ -460,10 +460,10 @@ $ case of the second string is preserved.
 $ 
 40 
 
-$
+$ 
 $    Messages 41-42 are written to an error file.
 $    YOU DO NOT NEED TO LOCALIZE MESSAGE 41-42.
-$
+$ 
 41 Insufficient memory to get LANG environment variable.
 42 Insufficient memory for menu item label
 
@@ -694,14 +694,14 @@ $ copy of the main panel control exists in the subpanel.
 
 $ Message 10 - 19 are the menu title, menu items, and mnemonics in the
 $ Main/Subpanel Menu.
-$
+$ 
 $ The entries are paired (label + mnemonic). The label appears in the
 $ menu. The mnemonic is the character in the label that is underlined by
 $ the menu system indicating that it is a keyboard shortcut.
-$
+$ 
 $ The mnemonic must be a character in the label. Each mnemonic must be 
 $ unique within this particular menu.
-$
+$ 
 10 Add Subpanel
 11 A
 12 Delete Subpanel
@@ -721,14 +721,14 @@ $ arg in the format.
 
 $ Message 22 - 30 are the menu title, menu items, and mnemonics in the
 $ Switch Menu.
-$
+$ 
 $ The entries are paired (label + mnemonic). The label appears in the
 $ menu. The mnemonic is the character in the label that is underlined by
 $ the menu system indicating that it is a keyboard shortcut.
-$
+$ 
 $ The mnemonic must be a character in the label. Each mnemonic must be 
 $ unique within this particular menu.
-$
+$ 
 22 Switch Area
 23 Add Workspace
 24 A
@@ -755,7 +755,7 @@ $ Used for Install Icon title in Install Icon popup menu.
 $set 84
 $    THIS COMMENT FOR DTWM TEAM ONLY -- UI.c --
 $    This entire set should be localized.
-$
+$ 
 $ Message used for the label of the dynamic install area.
 1 Install Icon