CONFIG: add compiler config for gcc-9

Caveat: The -Wdeprecated-copy produces many, many compiler warnings

etc/config.csh/compiler

@@ -2,10 +2,10 @@
 # =========                 |
 # \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
 #  \\    /   O peration     |
-#   \\  /    A nd           | Copyright (C) 2016-2018 OpenCFD Ltd.
+#   \\  /    A nd           | Copyright (C) 2016-2019 OpenCFD Ltd.
 #    \\/     M anipulation  |
 #------------------------------------------------------------------------------
-#                           | Copyright (C) 2016 OpenFOAM Foundation
+#                           | Copyright (C) 2011-2016 OpenFOAM Foundation
 #------------------------------------------------------------------------------
 # License
 #     This file is part of OpenFOAM, licensed under GNU General Public License
@@ -85,6 +85,12 @@ case ThirdParty:
     case Gcc82*:
         set gcc_version=gcc-8.2.0
         breaksw
+    case Gcc83*:
+        set gcc_version=gcc-8.3.0
+        breaksw
+    case Gcc91*:
+        set gcc_version=gcc-9.1.0
+        breaksw
     case Clang:
     case Clang37*:
         set clang_version=llvm-3.7.1

etc/config.sh/compiler

@@ -2,7 +2,7 @@
 # =========                 |
 # \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
 #  \\    /   O peration     |
-#   \\  /    A nd           | Copyright (C) 2016-2018 OpenCFD Ltd.
+#   \\  /    A nd           | Copyright (C) 2016-2019 OpenCFD Ltd.
 #    \\/     M anipulation  |
 #------------------------------------------------------------------------------
 #                           | Copyright (C) 2011-2016 OpenFOAM Foundation
@@ -83,6 +83,12 @@ ThirdParty)
     Gcc82*)
         gcc_version=gcc-8.2.0
         ;;
+    Gcc83*)
+        gcc_version=gcc-8.3.0
+        ;;
+    Gcc91*)
+        gcc_version=gcc-9.1.0
+        ;;
     Clang | Clang37*)
         clang_version=llvm-3.7.1
         ;;