openspace: init at 0.11.1

This adds a new package: OpenSpace, an open source astrovisualization
project, and one of its dependencies: SOIL (Simple OpenGL Image
Library).

This kind of works for me, but please note that this build is not very
usable for now. This is a first attempt. Also, Linux doesn't seem to
be well supported upstream, hence the various patches (I will open an
issue upstream to discuss them).

Squashed commits:
openspace: fetch upstream glm "patch"
openspace: add missing dependency (libXxf86vm)
soil: mesa -> mesa_noglu

pkgs/development/libraries/soil/default.nix

@@ -0,0 +1,28 @@
+{ stdenv, fetchurl, unzip, mesa_noglu, libX11 }:
+
+stdenv.mkDerivation rec {
+  name = "soil";
+
+  src = fetchurl {
+    url    = "http://www.lonesock.net/files/soil.zip";
+    sha256 = "00gpwp9dldzhsdhksjvmbhsd2ialraqbv6v6dpikdmpncj6mnc52";
+  };
+
+  buildInputs = [ unzip mesa_noglu libX11 ];
+  
+  sourceRoot = "Simple OpenGL Image Library/projects/makefile";
+  preBuild   = "mkdir obj";
+  preInstall = "mkdir -p $out/lib $out/include";
+  makeFlags  = [ "LOCAL=$(out)" ];
+
+  meta = {
+    description     = "Simple OpenGL Image Library";
+    longDescription = ''
+      SOIL is a tiny C library used primarily for uploading textures
+      into OpenGL.
+    '';
+    homepage  = https://www.lonesock.net/soil.html;
+    license   = stdenv.lib.licenses.publicDomain;
+    platforms = stdenv.lib.platforms.linux;
+  };
+}