Move uclibc to uclibc-ng

In order to keep coherence between upstream project's name.

Also, aliasing it to the older names uclibc and uclibcCross.

pkgs/top-level/all-packages.nix

···
     buildBarebox
     bareboxTools;
 
-  uclibc = callPackage ../os-specific/linux/uclibc { };
+  uclibc-ng = callPackage ../os-specific/linux/uclibc-ng { };
 
-  uclibcCross = callPackage ../os-specific/linux/uclibc {
+  uclibc-ng-cross = callPackage ../os-specific/linux/uclibc-ng {
     stdenv = crossLibcStdenv;
   };
+
+  # Aliases
+  uclibc = uclibc-ng;
+  uclibcCross = uclibc-ng-cross;
 
   eudev = callPackage ../os-specific/linux/eudev { util-linux = util-linuxMinimal; };