Turn more licenses into lib.licenses style

Should eval cleanly, as far as -A tarball tells me.

Relevant: issue #2999, issue #739

pkgs/development/libraries/allegro/5-unstable.nix

@@ -45,7 +45,7 @@ rec {
 
   meta = {
     description = "A game programming library";
-    license = "free-noncopyleft"; # giftware
+    license = a.lib.licenses.free; # giftware
     maintainers = with a.lib.maintainers;
     [
       raskin
@@ -55,4 +55,3 @@ rec {
     inherit version;
   };
 }) x
-

pkgs/development/libraries/allegro/5.nix

@@ -44,7 +44,7 @@ rec {
 
   meta = {
     description = "A game programming library";
-    license = "free-noncopyleft"; # giftware
+    license = a.lib.licenses.free; # giftware
     maintainers = with a.lib.maintainers;
     [
       raskin
@@ -54,4 +54,3 @@ rec {
     inherit version;
   };
 }) x
-

pkgs/development/libraries/allegro/default.nix

@@ -43,7 +43,7 @@ rec {
   meta = {
     branch = "4";
     description = "A game programming library";
-    license = "free-noncopyleft"; # giftware
+    license = a.lib.licenses.free; # giftware
     maintainers = with a.lib.maintainers;
     [
       raskin
@@ -57,4 +57,3 @@ rec {
     };
   };
 }) x
-