glibc: restore version passthru

downstream packages use the major.minor version
to determine ABI compatibility and paths which
do not depend on patch version

pkgs/development/libraries/glibc/common.nix

@@ -186,6 +186,9 @@ stdenv.mkDerivation ({
   # prevent a retained dependency on the bootstrap tools in the stdenv-linux
   # bootstrap.
   BASH_SHELL = "/bin/sh";
+
+  # Used by libgcc, elf-header, and others to determine ABI
+  passthru = { inherit version; };
 }
 
 // (removeAttrs args [ "withLinuxHeaders" "withGd" ]) //