mesa, mesa-darwin: free up floating point textures (patents expired)

https://cgit.freedesktop.org/mesa/mesa/commit/?id=66673bef941af344314fe9c91cad8cd330b245eb
https://www.phoronix.com/scan.php?page=news_item&px=OpenGL-Texture-Float-Freed

pkgs/development/libraries/mesa-darwin/default.nix

@@ -50,6 +50,12 @@ let
 
     configurePhase = ":";
 
+    configureFlags = [
+      # NOTE: Patents expired on June 17 2018.
+      # For details see: https://www.phoronix.com/scan.php?page=news_item&px=OpenGL-Texture-Float-Freed
+      "texture-float"
+    ];
+
     makeFlags = "INSTALL_DIR=\${out} CC=cc CXX=c++";
 
     enableParallelBuilding = true;

pkgs/development/libraries/mesa/default.nix

@@ -6,9 +6,6 @@
 , libglvnd
 , grsecEnabled ? false
 , enableRadv ? true
-# Texture floats are patented, see docs/patents.txt, so we don't enable them for full Mesa.
-# It's overridden for mesa_drivers.
-, enableTextureFloats ? false
 , galliumDrivers ? null
 , driDrivers ? null
 , vulkanDrivers ? null
@@ -115,7 +112,6 @@ let self = stdenv.mkDerivation {
       ("--with-vulkan-drivers=" +
         builtins.concatStringsSep "," vulkanDrivers))
   ++ [
-    (enableFeature enableTextureFloats "texture-float")
     (enableFeature grsecEnabled "glx-rts")
     (enableFeature stdenv.isLinux "dri3")
     (enableFeature stdenv.isLinux "nine") # Direct3D in Wine

pkgs/top-level/all-packages.nix

@@ -10962,7 +10962,6 @@ with pkgs;
   mesa_drivers =
     let mo = mesa_noglu.override {
       grsecEnabled = config.grsecurity or false;
-      enableTextureFloats = true;
     };
     in mo.drivers;