treewide: Fix meta.platforms related typos

pkgs/development/interpreters/picolisp/default.nix

@@ -41,7 +41,7 @@ stdenv.mkDerivation rec {
     description = "A simple Lisp with an integrated database";
     homepage = http://picolisp.com/;
     license = licenses.mit;
-    platform = platforms.all;
+    platforms = platforms.all;
     maintainers = with maintainers; [ raskin tohl ];
   };
 

pkgs/development/libraries/assimp/default.nix

@@ -20,7 +20,6 @@ stdenv.mkDerivation {
     homepage = http://assimp.sourceforge.net/;
     license = licenses.bsd3;
     maintainers = with maintainers; [ ehmry ];
-    platfroms = [ platforms.linux platforms.darwin ];
-    inherit version;
+    platforms = platforms.unix;
   };
 }

pkgs/development/libraries/zeromq/3.x.nix

@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
     homepage = "http://www.zeromq.org";
     description = "The Intelligent Transport Layer";
     license = licenses.gpl3;
-    platform = platforms.all;
+    platforms = platforms.all;
     maintainers = with maintainers; [ wkennington ];
   };
 }

pkgs/development/web/valum/default.nix

@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
   meta = with stdenv.lib; {
     homepage = https://github.com/valum-framework/valum;
     description = "Web micro-framework written in Vala";
-    plaforms = platforms.linux;
+    platforms = platforms.linux;
     maintainers = [ maintainers.lethalman ];
   };
 }