STYLE: remove erroneous and unused setcompression IO manipulator

- cannot change stream compression after construction.

src/OpenFOAM/db/IOstreams/IOstreams/IOmanip.H

@@ -4,6 +4,8 @@
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2004-2019 OpenCFD Ltd.
      \\/     M anipulation  |
+-------------------------------------------------------------------------------
+                            | Copyright (C) 2011 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -193,15 +195,6 @@ inline Omanip<IOstream::versionNumber> setversion
 }
 
 
-inline Omanip<IOstream::compressionType> setcompression
-(
-    const IOstream::compressionType cmp
-)
-{
-    return Omanip<IOstream::compressionType>(&IOstream::compression, cmp);
-}
-
-
 inline Omanip<int> setw(const int i)
 {
     return Omanip<int>(&Ostream::width, i);