openjdk: extract common meta

Also expands Darwin's openjdk.meta to include most attrs of Linux'

pkgs/development/compilers/openjdk/11.nix

@@ -136,14 +136,7 @@ let
 
     disallowedReferences = [ openjdk11-bootstrap ];
 
-    meta = with lib; {
-      homepage = "http://openjdk.java.net/";
-      license = licenses.gpl2;
-      description = "The open-source Java Development Kit";
-      maintainers = with maintainers; [ edwtjo asbachb ];
-      platforms = [ "i686-linux" "x86_64-linux" "aarch64-linux" "armv7l-linux" "armv6l-linux" ];
-      mainProgram = "java";
-    };
+    meta = import ./meta.nix lib;
 
     passthru = {
       architecture = "";

pkgs/development/compilers/openjdk/12.nix

@@ -145,14 +145,7 @@ let
 
     disallowedReferences = [ openjdk11 ];
 
-    meta = with lib; {
-      homepage = "http://openjdk.java.net/";
-      license = licenses.gpl2;
-      description = "The open-source Java Development Kit";
-      maintainers = with maintainers; [ edwtjo ];
-      platforms = [ "i686-linux" "x86_64-linux" "aarch64-linux" "armv7l-linux" "armv6l-linux" ];
-      mainProgram = "java";
-    };
+    meta = import ./meta.nix lib;
 
     passthru = {
       architecture = "";

pkgs/development/compilers/openjdk/13.nix

@@ -145,14 +145,7 @@ let
 
     disallowedReferences = [ openjdk13-bootstrap ];
 
-    meta = with lib; {
-      homepage = "http://openjdk.java.net/";
-      license = licenses.gpl2;
-      description = "The open-source Java Development Kit";
-      maintainers = with maintainers; [ edwtjo ];
-      platforms = [ "i686-linux" "x86_64-linux" "aarch64-linux" "armv7l-linux" "armv6l-linux" ];
-      mainProgram = "java";
-    };
+    meta = import ./meta.nix lib;
 
     passthru = {
       architecture = "";

pkgs/development/compilers/openjdk/14.nix

@@ -141,14 +141,7 @@ let
 
     disallowedReferences = [ openjdk14-bootstrap ];
 
-    meta = with lib; {
-      homepage = "https://openjdk.java.net/";
-      license = licenses.gpl2;
-      description = "The open-source Java Development Kit";
-      maintainers = with maintainers; [ edwtjo ];
-      platforms = [ "i686-linux" "x86_64-linux" "aarch64-linux" "armv7l-linux" "armv6l-linux" ];
-      mainProgram = "java";
-    };
+    meta = import ./meta.nix lib;
 
     passthru = {
       architecture = "";

pkgs/development/compilers/openjdk/15.nix

@@ -141,14 +141,7 @@ let
 
     disallowedReferences = [ openjdk15-bootstrap ];
 
-    meta = with lib; {
-      homepage = "https://openjdk.java.net/";
-      license = licenses.gpl2;
-      description = "The open-source Java Development Kit";
-      maintainers = with maintainers; [ edwtjo ];
-      platforms = [ "i686-linux" "x86_64-linux" "aarch64-linux" "armv7l-linux" "armv6l-linux" ];
-      mainProgram = "java";
-    };
+    meta = import ./meta.nix lib;
 
     passthru = {
       architecture = "";

pkgs/development/compilers/openjdk/16.nix

@@ -147,14 +147,7 @@ let
 
     disallowedReferences = [ openjdk16-bootstrap ];
 
-    meta = with lib; {
-      homepage = "https://openjdk.java.net/";
-      license = licenses.gpl2;
-      description = "The open-source Java Development Kit";
-      maintainers = with maintainers; [ edwtjo ];
-      platforms = [ "i686-linux" "x86_64-linux" "aarch64-linux" "armv7l-linux" "armv6l-linux" ];
-      mainProgram = "java";
-    };
+    meta = import ./meta.nix lib;
 
     passthru = {
       architecture = "";

pkgs/development/compilers/openjdk/darwin/11.nix

@@ -53,10 +53,6 @@ let
       home = jdk;
     };
 
-    meta = with lib; {
-      license = licenses.gpl2;
-      platforms = platforms.darwin;
-    };
-
+    meta = import ./meta.nix lib;
   };
 in jdk

pkgs/development/compilers/openjdk/darwin/8.nix

@@ -57,10 +57,6 @@ let
       home = jdk;
     };
 
-    meta = with lib; {
-      license = licenses.gpl2;
-      platforms = platforms.darwin;
-    };
-
+    meta = import ./meta.nix lib;
   };
 in jdk

pkgs/development/compilers/openjdk/darwin/default.nix

@@ -54,10 +54,6 @@ let
       home = jdk;
     };
 
-    meta = with lib; {
-      license = licenses.gpl2;
-      platforms = platforms.darwin;
-    };
-
+    meta = import ./meta.nix lib;
   };
 in jdk

pkgs/development/compilers/openjdk/darwin/meta.nix

@@ -0,0 +1,4 @@
+lib: (removeAttrs (import ../meta.nix lib) [ "maintainers" ]) // {
+  platforms = lib.platforms.darwin;
+  homepage = "https://www.azul.com/";
+}

pkgs/development/compilers/openjdk/meta.nix

@@ -0,0 +1,8 @@
+lib: with lib; {
+  homepage = "http://openjdk.java.net/";
+  license = licenses.gpl2;
+  description = "The open-source Java Development Kit";
+  maintainers = with maintainers; [ edwtjo asbachb ];
+  platforms = [ "i686-linux" "x86_64-linux" "aarch64-linux" "armv7l-linux" "armv6l-linux" ];
+  mainProgram = "java";
+}