gcc10StdenvCompat: fix the intended logic

See commit 8bdc1401a2 from PR #175177

arc_unpacker has already been fixed not to need the override.
Maybe also in other cases this isn't useful anymore,
but at least the attribute makes some sense again.

pkgs/top-level/all-packages.nix

@@ -1244,7 +1244,6 @@ with pkgs;
 
   arc_unpacker = callPackage ../tools/archivers/arc_unpacker {
     boost = boost16x; # checkPhase fails with Boost 1.77
-    stdenv = gcc10StdenvCompat;
   };
 
   adminer = callPackage ../servers/adminer { };
@@ -14309,7 +14308,8 @@ with pkgs;
   gcc11Stdenv = overrideCC gccStdenv buildPackages.gcc11;
   gcc12Stdenv = overrideCC gccStdenv buildPackages.gcc12;
 
-  gcc10StdenvCompat = if stdenv.cc.isGNU && lib.versions.major stdenv.cc.version == "11" then gcc10Stdenv else stdenv;
+  # Meant for packages that fail with newer than gcc10.
+  gcc10StdenvCompat = if stdenv.cc.isGNU && lib.versionAtLeast stdenv.cc.version "11" then gcc10Stdenv else stdenv;
 
   # This is not intended for use in nixpkgs but for providing a faster-running
   # compiler to nixpkgs users by building gcc with reproducibility-breaking