futhark: only wrap the 'futhark' executable

Newer versions of Futhark only care about this executable, and the
others are thin wrappers that will go away in a future version.

pkgs/development/haskell-modules/configuration-nix.nix

@@ -536,10 +536,7 @@ self: super: builtins.intersectAttrs super {
     let path = stdenv.lib.makeBinPath [ gcc ];
     in overrideCabal (addBuildTool super.futhark makeWrapper) (_drv: {
       postInstall = ''
-        wrapProgram $out/bin/futhark-c \
-          --prefix PATH : "${path}"
-
-        wrapProgram $out/bin/futhark-opencl \
+        wrapProgram $out/bin/futhark \
           --prefix PATH : "${path}" \
           --set NIX_CC_WRAPPER_x86_64_unknown_linux_gnu_TARGET_HOST 1 \
           --set NIX_CFLAGS_COMPILE "-I${opencl-headers}/include" \