cudatoolkit: build versions 9.2+ with gcc7

closes issue #50040

pkgs/development/compilers/cudatoolkit/default.nix

@@ -1,5 +1,5 @@
 { lib, stdenv, makeWrapper, fetchurl, requireFile, perl, ncurses, expat, python27, zlib
-, gcc48, gcc49, gcc5, gcc6
+, gcc48, gcc49, gcc5, gcc6, gcc7
 , xorg, gtk2, glib, fontconfig, freetype, unixODBC, alsaLib, glibc
 }:
 
@@ -229,7 +229,7 @@ in rec {
         sha256 = "1kx6l4yzsamk6q1f4vllcpywhbfr2j5wfl4h5zx8v6dgfpsjm2lw";
       })
     ];
-    gcc = gcc6;
+    gcc = gcc7;
   };
 
   cudatoolkit_9 = cudatoolkit_9_2;
@@ -239,7 +239,7 @@ in rec {
     url = "https://developer.nvidia.com/compute/cuda/10.0/Prod/local_installers/cuda_10.0.130_410.48_linux";
     sha256 = "16p3bv1lwmyqpxil8r951h385sy9asc578afrc7lssa68c71ydcj";
 
-    gcc = gcc6;
+    gcc = gcc7;
   };
 
   cudatoolkit_10 = cudatoolkit_10_0;