Remove dependencies on xwin and zig.  We're not offering cross-compilation
options using these crates.

diff --git a/Cargo.toml b/Cargo.toml
index 6704e46..ff126a9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -83,16 +83,6 @@ version = "0.1.16"
 [dependencies.cargo-options]
 version = "0.7.2"
 
-[dependencies.cargo-xwin]
-version = "0.16.2"
-optional = true
-default-features = false
-
-[dependencies.cargo-zigbuild]
-version = "0.18.0"
-optional = true
-default-features = false
-
 [dependencies.cargo_metadata]
 version = "0.18.0"
 
@@ -321,8 +311,6 @@ version = "5.0.0"
 [features]
 cli-completion = ["dep:clap_complete_command"]
 cross-compile = [
-    "zig",
-    "xwin",
 ]
 default = [
     "full",
@@ -341,7 +329,6 @@ log = ["tracing-subscriber"]
 native-tls = [
     "dep:native-tls",
     "ureq?/native-tls",
-    "cargo-xwin?/native-tls",
     "dep:rustls-pemfile",
 ]
 password-storage = [
@@ -351,7 +338,6 @@ password-storage = [
 rustls = [
     "dep:rustls",
     "ureq?/tls",
-    "cargo-xwin?/rustls-tls",
     "dep:rustls-pemfile",
 ]
 scaffolding = [
@@ -369,5 +355,3 @@ upload = [
     "wild",
     "dep:dirs",
 ]
-xwin = ["cargo-xwin"]
-zig = ["cargo-zigbuild"]
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<div class='path'>path: <a href='/guix/log/?id=8ce96d84470912cadb6ecb03002236c52234dd9b'>root</a>/<a href='/guix/log/gnu?id=8ce96d84470912cadb6ecb03002236c52234dd9b'>gnu</a>/<a href='/guix/log/gnu/services?id=8ce96d84470912cadb6ecb03002236c52234dd9b'>services</a>/<a href='/guix/log/gnu/services/sound.scm?id=8ce96d84470912cadb6ecb03002236c52234dd9b'>sound.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/sound.scm?id=8ce96d84470912cadb6ecb03002236c52234dd9b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-05-06 22:49:55 +0200'>2020-05-06</span></td><td><a href='/guix/commit/gnu/services/sound.scm?id=3ed94ed8c2d1d0befc99ef2740b6fb9f717207db'>services: Do not use symbolic links in PulseAudio variables.</a><span class='msg-avail'>...<span class='msg-tooltip'>This addresses &lt;https://bugs.gnu.org/40837&gt; by making these configuration
files more easily accessible within the WebKitGTK sandbox.

* gnu/services/sound.scm (pulseaudio-environment): Move below
PULSEAUDIO-CONF-ENTRY.  Instantiate PULSE_CONFIG and PULSE_CLIENTCONFIG
entries directly instead of referring to /etc/pulse.
(pulseaudio-etc): Do not create /etc/pulse/client.conf and /etc/pulse/daemon.conf.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-01-11 18:18:51 +0100'>2020-01-11</span></td><td><a href='/guix/commit/gnu/services/sound.scm?id=f1022fbf2f16b0c9ae9fa0f8af4e61e035fec4cf'>services: Split ladspa-service-type from pulseaudio-service-type.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/sound.scm (ladspa-configuration): New record.
(ladspa-environment): New procedure.
(ladspa-service-type): New service type.
(pulseaudio-environment): Remove LADSPA_PATH.
* doc/guix.texi: Adjust documentation.

Signed-off-by: Marius Bakke &lt;mbakke@fastmail.com&gt;
</span></span></td><td>Leo Prikler</td></tr>
<tr><td><span title='2020-01-11 18:18:51 +0100'>2020-01-11</span></td><td><a href='/guix/commit/gnu/services/sound.scm?id=f6f918113052fe781fa7a1c4c6b666b5aa57c834'>services: pulseaudio-configuration: Set flat-volumes to no.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/sound (pulseaudio-configuration) [daemon-conf]: Disable
flat-volumes, which causes unpleasant experiences to users when applications
inadvertently max out the system volume (e.g. as in #38172).

Signed-off-by: Marius Bakke &lt;mbakke@fastmail.com&gt;
</span></span></td><td>Leo Prikler</td></tr>
<tr><td><span title='2020-01-11 18:18:50 +0100'>2020-01-11</span></td><td><a href='/guix/commit/gnu/services/sound.scm?id=f547426200d5547268d4a4a8f51c913072fa622f'>services: Add pulseaudio-configuration.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/sound (&lt;pulseaudio-configuration&gt;): New record.
(pulseaudio-etc): New procedure.
(pulseaudio-environment): Add PULSE_CONFIG and PULSE_CLIENTCONFIG.
(pulseaudio-service-type): Update accordingly.

Signed-off-by: Marius Bakke &lt;mbakke@fastmail.com&gt;
</span></span></td><td>Leo Prikler</td></tr>
<tr><td><span title='2020-01-08 10:21:45 +0300'>2020-01-08</span></td><td><a href='/guix/commit/gnu/services/sound.scm?id=a66ee82a05d8ff1ef7c5ff9ac7723cb32fc4e22a'>services: Add pulseaudio service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/sound.scm (pulseaudio-environment): New procedure.
(pulseaudio-service-type): New variable.
* doc/guix.texi (Sound Services): Document it.
</span></span></td><td>Oleg Pykhalov</td></tr>