rhel: Add gcc and gcc-c++ to BuildRequires
Starting from Fedora 29, gcc and gcc-c++ won't be installed by default in
buildroot and so it's necessary to specify them explicitly in the spec file.
@@ -66,6 +66,7 @@ License: ASL 2.0 and LGPLv2+ and SISSL
Release: 1%{?dist}
Source: http://openvswitch.org/releases/%{name}-%{version}.tar.gz
+BuildRequires: gcc gcc-c++
BuildRequires: autoconf automake libtool
BuildRequires: systemd-units openssl openssl-devel
BuildRequires: %{_py2}-devel
