nano.spec: drop BR for autoconf

... which is no longer needed

nano.spec

@@ -1,7 +1,7 @@
 Summary:         A small text editor
 Name:            nano
 Version:         2.3.6
-Release:         3%{?dist}
+Release:         4%{?dist}
 License:         GPLv3+
 Group:           Applications/Editors
 URL:             http://www.nano-editor.org
@@ -16,7 +16,6 @@ Patch1:          0001-check-stat-s-result-and-avoid-calling-stat-on-a-NULL.patch
 Patch2:          0002-use-futimens-if-available-instead-of-utime.patch
 
 BuildRoot:       %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
-BuildRequires:   autoconf
 BuildRequires:   file-devel
 BuildRequires:   gettext-devel
 BuildRequires:   groff
@@ -90,6 +89,9 @@ exit 0
 %{_datadir}/nano
 
 %changelog
+* Mon Jan 05 2015 Kamil Dudka <kdudka@redhat.com> - 2.3.6-4
+- drop BR for autoconf, which is no longer needed
+
 * Mon Jan 05 2015 Kamil Dudka <kdudka@redhat.com> - 2.3.6-3
 - do not use closed file descriptor when setting backup's timestamp (#1177155)