pulseaudio: Fix detection of ALSA UCM

This one was a bit tricky to find because it only causes a runtime
error, and pulseaudio has shims for most ALSA UCM methods except one.
(I guess nobody ever really tests pulseaudio in combination with
UCM-less ALSA?)

ALSA 1.1.8 had ${alsa-dev}/include/alsa/ in the pkg-config file, which
was considered wrong and fixed in 1.1.9.

However, pulseaudio was relying on being able to include ALSA headers
like <asoundlib.h> and <use-case.h> rather than <alsa/asoundlib.h> and
<alsa/use-case.h>. (For asoundlib.h it only causes a warning, because
the ALSA guys created a shim for that header.)

These two patches change pulseaudio to use the correct include
directives.

pkgs/servers/pulseaudio/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, pkgconfig, intltool, autoreconfHook
+{ lib, stdenv, fetchurl, fetchpatch, pkgconfig, intltool, autoreconfHook
 , libsndfile, libtool, makeWrapper
 , xorg, libcap, alsaLib, glib, gnome3
 , avahi, libjack2, libasyncns, lirc, dbus
@@ -117,6 +117,19 @@ stdenv.mkDerivation rec {
      --prefix GIO_EXTRA_MODULES : "${lib.getLib gnome3.dconf}/lib/gio/modules"
   '';
 
+  patches = [
+    (fetchpatch {
+      name = "alsa-asoundlib-include.patch";
+      url = "https://gitlab.freedesktop.org/pulseaudio/pulseaudio/commit/993d3fd89e5611997f1e165bf03edefb0204b0a4.patch";
+      sha256 = "17icnf8026947j1dqw4k16f91vy6zyg7q41zv2j6pxh9fncb1s71";
+    })
+    (fetchpatch {
+      name = "alsa-use-case-include.patch";
+      url = "https://gitlab.freedesktop.org/pulseaudio/pulseaudio/commit/b89d33bb182c42db5ad3987b0e91b7bf62f421e8.patch";
+      sha256 = "0jccpc0dgkb0v4xrkyca2pm2k4i6pvahs9bq4hbg34173p23g5nb";
+    })
+  ];
+
   meta = {
     description = "Sound server for POSIX and Win32 systems";
     homepage    = http://www.pulseaudio.org/;