scala_{2_12,2_13}: set pname (#486709)

pkgs/development/compilers/scala/2.x.nix

@@ -37,7 +37,7 @@ with versionMap.${majorVersion};
 stdenv.mkDerivation rec {
   inherit version;
 
-  name = "scala-${version}";
+  pname = "scala";
 
   src = fetchurl {
     inherit hash;
@@ -55,7 +55,7 @@ stdenv.mkDerivation rec {
     mv * $out
     # put docs in correct subdirectory
     mkdir -p $out/share/doc
-    mv $out/doc $out/share/doc/${name}
+    mv $out/doc $out/share/doc/${pname}-${version}
     mv $out/man $out/share/man
     for p in $(ls $out/bin/) ; do
         wrapProgram $out/bin/$p \