spec: Use HTTPS instead of HTTP

libvirt.org supports HTTPS, so might as well use it.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>

libvirt.spec.in

@@ -231,12 +231,12 @@ Release: 1%{?dist}%{?extra_release}
 License: LGPLv2+
 Group: Development/Libraries
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
-URL: http://libvirt.org/
+URL: https://libvirt.org/
 
 %if %(echo %{version} | grep -q "\.0$"; echo $?) == 1
     %define mainturl stable_updates/
 %endif
-Source: http://libvirt.org/sources/%{?mainturl}libvirt-%{version}.tar.xz
+Source: https://libvirt.org/sources/%{?mainturl}libvirt-%{version}.tar.xz
 
 Requires: libvirt-daemon = %{version}-%{release}
 Requires: libvirt-daemon-config-network = %{version}-%{release}

mingw-libvirt.spec.in

@@ -29,12 +29,12 @@ Summary:        MinGW Windows libvirt virtualization library
 
 License:        LGPLv2+
 Group:          Development/Libraries
-URL:            http://libvirt.org/
+URL:            https://libvirt.org/
 
 %if %(echo %{version} | grep -q "\.0$"; echo $?) == 1
     %define mainturl stable_updates/
 %endif
-Source: http://libvirt.org/sources/%{?mainturl}libvirt-%{version}.tar.xz
+Source: https://libvirt.org/sources/%{?mainturl}libvirt-%{version}.tar.xz
 
 BuildRequires:  mingw32-filesystem >= 95
 BuildRequires:  mingw64-filesystem >= 95