Adapt to new packaging

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

libloading-fix-metadata.diff

@@ -1,5 +1,5 @@
 --- libloading-0.5.0/Cargo.toml	1970-01-01T01:00:00+01:00
-+++ libloading-0.5.0/Cargo.toml	2018-02-21T10:03:18.726606+01:00
++++ libloading-0.5.0/Cargo.toml	2018-11-04T08:06:41.550456+01:00
 @@ -22,6 +22,3 @@
  repository = "https://github.com/nagisa/rust_libloading/"
  [build-dependencies.cc]

rust-libloading.spec

@@ -6,7 +6,7 @@
 
 Name:           rust-%{crate}
 Version:        0.5.0
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Safer binding to platform’s dynamic library loading utilities
 
 License:        ISC
@@ -14,26 +14,43 @@ URL:            https://crates.io/crates/libloading
 Source0:        https://crates.io/api/v1/crates/%{crate}/%{version}/download#/%{crate}-%{version}.crate
 # Initial patched metadata
 # * No windows
-Patch0:         libloading-0.5.0-fix-metadata.diff
+Patch0:         libloading-fix-metadata.diff
 
 ExclusiveArch:  %{rust_arches}
 
 BuildRequires:  rust-packaging
-# [build-dependencies]
-BuildRequires:  (crate(cc) >= 1.0.0 with crate(cc) < 2.0.0)
+BuildRequires:  (crate(cc/default) >= 1.0.0 with crate(cc/default) < 2.0.0)
 
-%description
-%{summary}.
+%global _description \
+A safer binding to platform’s dynamic library loading utilities.
+
+%description %{_description}
 
 %package        devel
 Summary:        %{summary}
 BuildArch:      noarch
 
-%description    devel
-A safer binding to platform’s dynamic library loading utilities.
+%description    devel %{_description}
 
 This package contains library source intended for building other packages
-which use %{crate} from crates.io.
+which use "%{crate}" crate.
+
+%files          devel
+%license LICENSE
+%doc README.mkd
+%{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
@@ -50,13 +67,10 @@ which use %{crate} from crates.io.
 %cargo_test
 %endif
 
-%files          devel
-%license LICENSE
-%doc README.mkd
-%{cargo_registry}/%{crate}-%{version}/
-%exclude %{cargo_registry}/%{crate}-%{version}/appveyor.yml
-
 %changelog
+* Sun Nov 04 2018 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.5.0-3
+- Adapt to new packaging
+
 * Sat Jul 14 2018 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.0-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild