libpulseaudio: fix aarch64-darwin build

Removes darwin Libc buildInput, which does not appear to be needed on
x86_64, and which does not support aarch64 at all (too old)

pkgs/servers/pulseaudio/default.nix

@@ -26,7 +26,7 @@
 , # Whether to build only the library.
   libOnly ? false
 
-, AudioUnit, Cocoa, CoreServices, Libc
+, AudioUnit, Cocoa, CoreServices
 }:
 
 stdenv.mkDerivation rec {
@@ -49,7 +49,7 @@ stdenv.mkDerivation rec {
   buildInputs =
     [ libtool libsndfile soxr speexdsp fftwFloat ]
     ++ lib.optionals stdenv.isLinux [ glib dbus ]
-    ++ lib.optionals stdenv.isDarwin [ AudioUnit Cocoa CoreServices Libc ]
+    ++ lib.optionals stdenv.isDarwin [ AudioUnit Cocoa CoreServices ]
     ++ lib.optionals (!libOnly) (
       [ libasyncns webrtc-audio-processing ]
       ++ lib.optional jackaudioSupport libjack2
@@ -101,8 +101,6 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-I${Libc}";
-
   installFlags =
     [ "sysconfdir=${placeholder "out"}/etc"
       "pulseconfdir=${placeholder "out"}/etc/pulse"

pkgs/top-level/all-packages.nix

@@ -21323,7 +21323,6 @@ with pkgs;
   };
 
   pulseaudio = callPackage ../servers/pulseaudio ({
-    inherit (darwin) Libc;
     inherit (darwin.apple_sdk.frameworks) CoreServices AudioUnit Cocoa;
   } // lib.optionalAttrs stdenv.isDarwin {
     # Default autoreconfHook (2.70) fails on darwin,