waybar: fix build without cava support

With Waybar v0.10.0 a new "pipewire" module was added that will display
whether certain PipeWire features are certainly in use. Naturally, this
option requires libpipewire to be present. And by default it is getting
pulled in indeed via "cava" support flag. But when disabling that flag
then building Waybar will break due to the missing dependency.

Fix this by wiring up a new `pipewireSupport` flag. If either that flag
or the `cavaSupport` flag are set then we will pull in the "pipewire"
library.

pkgs/applications/misc/waybar/default.nix

@@ -51,6 +51,7 @@
 , mpdSupport ? true
 , mprisSupport ? stdenv.isLinux
 , nlSupport ? true
+, pipewireSupport ? true
 , pulseSupport ? true
 , rfkillSupport ? true
 , runTests ? true
@@ -122,7 +123,6 @@ stdenv.mkDerivation (finalAttrs: {
     fftw
     iniparser
     ncurses
-    pipewire
     portaudio
   ]
   ++ lib.optional evdevSupport libevdev
@@ -139,6 +139,7 @@ stdenv.mkDerivation (finalAttrs: {
   ++ lib.optional udevSupport udev
   ++ lib.optional upowerSupport upower
   ++ lib.optional wireplumberSupport wireplumber
+  ++ lib.optional (cavaSupport || pipewireSupport) pipewire
   ++ lib.optional (!stdenv.isLinux) libinotify-kqueue;
 
   nativeCheckInputs = [ catch2_3 ];
@@ -154,6 +155,7 @@ stdenv.mkDerivation (finalAttrs: {
     "man-pages" = true;
     "mpd" = mpdSupport;
     "mpris" = mprisSupport;
+    "pipewire" = pipewireSupport;
     "pulseaudio" = pulseSupport;
     "rfkill" = rfkillSupport;
     "sndio" = sndioSupport;