Merge glibc-2.18 branch into stdenv-updates

It's to separate from other changes coming from master.

Conflicts:
	pkgs/development/libraries/glibc/2.18/common.nix (taking both changes)
	pkgs/development/libraries/ncurses/5_4.nix (deleted)

pkgs/development/compilers/gcc/4.4/default.nix

@@ -246,7 +246,7 @@ stdenv.mkDerivation ({
       enableMultilib version; };
 
   # ghdl does not build fine with parallel building
-  enableParallelBuilding = !langVhdl;
+  enableParallelBuilding = !langVhdl && !langAda;
 
   meta = {
     homepage = http://gcc.gnu.org/;

pkgs/development/compilers/gcc/4.5/default.nix

@@ -360,7 +360,7 @@ stdenv.mkDerivation ({
   passthru = { inherit langC langCC langAda langFortran langVhdl
       enableMultilib version; };
 
-  enableParallelBuilding = true;
+  enableParallelBuilding = !langAda;
 
   meta = {
     homepage = http://gcc.gnu.org/;

pkgs/development/compilers/gcc/4.6/default.nix

@@ -434,7 +434,7 @@ stdenv.mkDerivation ({
   passthru = { inherit langC langCC langAda langFortran langVhdl
       langGo version; };
 
-  enableParallelBuilding = true;
+  enableParallelBuilding = !langAda;
 
   inherit (stdenv) is64bit;