premake: bump to version 4.3

aacskeys depends on premake3, so keep that version around.

pkgs/development/tools/misc/premake/default.nix

@@ -1,21 +1,25 @@
 {stdenv, fetchurl, unzip}:
 
 let baseName = "premake";
-    version  = "3.7";
+  version  = "4.3";
 in
 
 stdenv.mkDerivation {
   name = "${baseName}-${version}";
 
   src = fetchurl {
-    url = "http://downloads.sourceforge.net/sourceforge/premake/${baseName}-src-${version}.zip";
-    sha256 = "b59841a519e75d5b6566848a2c5be2f91455bf0cc6ae4d688fcbd4c40db934d5";
+    url = "mirror://sourceforge/${baseName}/${baseName}-${version}-src.zip";
+    sha256 = "1017rd0wsjfyq2jvpjjhpszaa7kmig6q1nimw76qx3cjz2868lrn";
   };
 
   buildInputs = [unzip];
 
+  buildPhase = ''
+    make -C build/gmake.unix/
+  '';
+
   installPhase = ''
-    install -Dm755 bin/premake $out/bin/premake
+    install -Dm755 bin/release/premake4 $out/bin/premake4
   '';
 
   meta = {