arrow-cpp: Remove redundant compiler override

We are not using gcc-7 by default anymore, and later gccs do not have this problem.

pkgs/top-level/all-packages.nix

@@ -16574,10 +16574,7 @@ with pkgs;
 
   arrayfire = callPackage ../development/libraries/arrayfire {};
 
-  arrow-cpp = callPackage ../development/libraries/arrow-cpp ({
-  } // lib.optionalAttrs (stdenv.hostPlatform.isi686 && stdenv.cc.isGNU) {
-    stdenv = overrideCC stdenv buildPackages.gcc6; # hidden symbol `__divmoddi4'
-  });
+  arrow-cpp = callPackage ../development/libraries/arrow-cpp {};
 
   arsenal = callPackage ../tools/security/arsenal { };