Adapt to new packaging

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

rust-cfg-if.spec

@@ -7,7 +7,7 @@
 
 Name:           rust-%{crate}
 Version:        0.1.6
-Release:        1%{?dist}
+Release:        3%{?dist}
 Summary:        Macro to ergonomically define an item depending on a large number of #[cfg] parameters
 
 # Upstream license specification: MIT/Apache-2.0
@@ -19,20 +19,38 @@ ExclusiveArch:  %{rust_arches}
 
 BuildRequires:  rust-packaging
 
-%description
+%global _description \
-%{summary}.
+A macro to ergonomically define an item depending on a large number of #[cfg]\
+parameters. Structured like an if-else chain, the first matching branch is the\
+item that gets emitted.
+
+%description %{_description}
 
 %package        devel
 Summary:        %{summary}
 BuildArch:      noarch
 
-%description    devel
+%description    devel %{_description}
-A macro to ergonomically define an item depending on a large number of #[cfg]
-parameters. Structured like an if-else chain, the first matching branch is the
-item that gets emitted.
 
 This package contains library source intended for building other packages
-which use %{crate} from crates.io.
+which use "%{crate}" crate.
+
+%files          devel
+%license LICENSE-MIT LICENSE-APACHE
+%doc README.md
+%{cargo_registry}/%{crate}-%{version}/
+
+%package     -n %{name}+default-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+default-devel %{_description}
+
+This package contains library source intended for building other packages
+which use "default" feature of "%{crate}" crate.
+
+%files       -n %{name}+default-devel
+%ghost %{cargo_registry}/%{crate}-%{version}/Cargo.toml
 
 %prep
 %autosetup -n %{crate}-%{version} -p1
@@ -49,12 +67,10 @@ which use %{crate} from crates.io.
 %cargo_test
 %endif
 
-%files          devel
-%license LICENSE-MIT LICENSE-APACHE
-%doc README.md
-%{cargo_registry}/%{crate}-%{version}/
-
 %changelog
+* Fri Oct 26 2018 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.1.6-3
+- Adapt to new rust-packaging
+
 * Mon Oct 22 2018 Josh Stone <jistone@redhat.com> - 0.1.6-1
 - Update to 0.1.6