Use common licence attributes from lib/licenses.nix

Many (less easily automatically converted) old-style strings
remain.

Where there was any possible ambiguity about the exact version or
variant intended, nothing was changed. IANAL, nor a search robot.

Use `with stdenv.lib` wherever it makes sense.

pkgs/applications/window-managers/awesome/default.nix

@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
   meta = with stdenv.lib; {
     description = "Highly configurable, dynamic window manager for X";
     homepage    = http://awesome.naquadah.org/;
-    license     = "GPLv2+";
+    license     = with licenses; gpl2Plus;
     maintainers = with maintainers; [ lovek323 ];
     platforms   = platforms.linux;
   };

pkgs/applications/window-managers/tabbed/default.nix

@@ -18,11 +18,11 @@ stdenv.mkDerivation rec {
     export makeFlags="PREFIX=$out"
   '';
  
-  meta = {
+  meta = with stdenv.lib; {
     homepage = http://tools.suckless.org/tabbed;
     description = "Simple generic tabbed fronted to xembed aware applications";
-    license="MIT";
-    maintainers = with stdenv.lib.maintainers; [viric];
-    platforms = with stdenv.lib.platforms; linux;
+    license = with licenses; mit;
+    maintainers = with maintainers; [ viric ];
+    platforms = with platforms; linux;
   };
 }

pkgs/applications/window-managers/vwm/default.nix

@@ -22,11 +22,11 @@ stdenv.mkDerivation rec {
  
   buildInputs = [ ncurses pkgconfig glib libviper libpseudo gpm libvterm ];
  
-  meta = {
+  meta = with stdenv.lib; {
     homepage = http://vwm.sourceforge.net/;
     description = "Dynamic window manager for the console";
-    license="GPLv2+";
-    maintainers = with stdenv.lib.maintainers; [viric];
-    platforms = with stdenv.lib.platforms; linux;
+    license = with licenses; gpl2Plus;
+    maintainers = with maintainers; [ viric ];
+    platforms = with platforms; linux;
   };
 }

pkgs/applications/window-managers/wmii/default.nix

@@ -30,6 +30,6 @@ args: with args; stdenv.mkDerivation {
   ";
   meta = { homepage = "www.suckless.org";
            description = "a really cool window manager which can by driven by keyboard only";
-           license="MIT";
+           license = stdenv.lib.licenses.mit;
          };
 }

pkgs/applications/window-managers/wmii31/default.nix

@@ -30,6 +30,6 @@ args: with args; stdenv.mkDerivation {
   ";
   meta = { homepage = "www.suckless.org";
            description = "One small tool of the wmii window manger to let the user select an item from a list by filtering";
-           license="MIT";
+           license = stdenv.lib.licenses.mit;
          };
 }