llvm*: compiler-rt: fix build w/glibc-2.31

https://hydra.nixos.org/build/122885657 and more.

Original upstream fix (available in llvm_10):

   https://github.com/llvm/llvm-project/commit/947f9692440836dcb8d88b74b69dd379d85974ce

pkgs/development/compilers/llvm/9/compiler-rt.nix

@@ -46,6 +46,7 @@ stdenv.mkDerivation rec {
   outputs = [ "out" "dev" ];
 
   patches = [
+    ../7/compiler-rt-glibc.patch
     ./compiler-rt-codesign.patch # Revert compiler-rt commit that makes codesign mandatory
   ]# ++ stdenv.lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
     ++ stdenv.lib.optional stdenv.hostPlatform.isAarch32 ./compiler-rt-armv7l.patch;