Adapt to new packaging

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

lazycell-fix-metadata.diff

@@ -1,5 +1,5 @@
---- lazycell-1.0.0/Cargo.toml	1970-01-01T01:00:00+01:00
+--- lazycell-1.2.0/Cargo.toml	1970-01-01T01:00:00+01:00
-+++ lazycell-1.0.0/Cargo.toml	2018-06-15T14:10:09.199669+02:00
++++ lazycell-1.2.0/Cargo.toml	2018-11-04T17:10:09.098108+01:00
 @@ -21,10 +21,3 @@
  keywords = ["lazycell", "lazy", "cell", "library"]
  license = "MIT/Apache-2.0"

rust-lazycell.spec

@@ -6,7 +6,7 @@
 
 Name:           rust-%{crate}
 Version:        1.2.0
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Library providing a lazily filled Cell struct
 
 # Upstream license specification: MIT/Apache-2.0
@@ -21,18 +21,36 @@ ExclusiveArch:  %{rust_arches}
 
 BuildRequires:  rust-packaging
 
-%description
+%global _description \
-%{summary}.
+A library providing a lazily filled Cell struct.
+
+%description %{_description}
 
 %package        devel
 Summary:        %{summary}
 BuildArch:      noarch
 
-%description    devel
+%description    devel %{_description}
-A library providing a lazily filled Cell struct.
 
 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 CHANGELOG.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 CHANGELOG.md
-%{cargo_registry}/%{crate}-%{version}/
-
 %changelog
+* Sun Nov 04 2018 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 1.2.0-2
+- Adapt to new packaging
+
 * Thu Sep 20 2018 Josh Stone <jistone@redhat.com> - 1.2.0-1
 - Update to 1.2.0