Do not pull optional dependencies

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

rust-memchr.spec

@@ -7,7 +7,7 @@
 
 Name:           rust-%{crate}
 Version:        2.2.0
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Safe interface to memchr
 
 # Upstream license specification: Unlicense/MIT
@@ -18,7 +18,6 @@ Source:         %{crates_source}
 ExclusiveArch:  %{rust_arches}
 
 BuildRequires:  rust-packaging
-BuildRequires:  (crate(libc) >= 0.2.18 with crate(libc) < 0.3.0)
 %if %{with check}
 BuildRequires:  (crate(quickcheck) >= 0.8.0 with crate(quickcheck) < 0.9.0)
 %endif
@@ -94,6 +93,9 @@ which use "use_std" feature of "%{crate}" crate.
 %endif
 
 %changelog
+* Sun Mar 10 2019 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 2.2.0-2
+- Do not pull optional dependencies
+
 * Tue Feb 12 2019 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 2.2.0-1
 - Update to 2.2.0