build: enable dracut-cpio binary

This binary uses reflinks to speed up initramfs generation on btrfs
and XFS filesystems so let's build it and include it in the dracut
package to speed up initramfs generation.

Author: Daan De Meyer <daan.j.demeyer@gmail.com>

https://src.fedoraproject.org/rpms/dracut/pull-request/62

.distro/dracut.spec

@@ -35,6 +35,7 @@ BuildRequires: gcc
 BuildRequires: pkgconfig
 BuildRequires: systemd
 BuildRequires: bash-completion
+BuildRequires: cargo
 
 %if %{with doc}
 BuildRequires: docbook-style-xsl docbook-dtds libxslt
@@ -46,6 +47,8 @@ Provides:  dracut-fips = %{version}-%{release}
 Obsoletes: dracut-fips-aesni <= 047
 Provides:  dracut-fips-aesni = %{version}-%{release}
 
+Provides: bundled(crate(crosvm)) = 0.1.0
+
 Requires: bash >= 4
 Requires: coreutils
 Requires: cpio
@@ -158,6 +161,7 @@ cp %{SOURCE1} .
 %configure  --systemdsystemunitdir=%{_unitdir} \
             --bashcompletiondir=$(pkg-config --variable=completionsdir bash-completion) \
             --libdir=%{_prefix}/lib \
+            --enable-dracut-cpio \
 %if %{without doc}
             --disable-documentation \
 %endif
@@ -226,6 +230,7 @@ echo 'dracut_rescue_image="yes"' > $RPM_BUILD_ROOT%{dracutlibdir}/dracut.conf.d/
 %{dracutlibdir}/dracut-install
 %{dracutlibdir}/dracut-util
 %{dracutlibdir}/skipcpio
+%{dracutlibdir}/dracut-cpio
 %config(noreplace) %{_sysconfdir}/dracut.conf
 %{dracutlibdir}/dracut.conf.d/01-dist.conf
 %dir %{_sysconfdir}/dracut.conf.d