Remove stale 'xmlto' BuildRequires

The X.org doc build pipeline requires both 'xmlto' and 'fop' to
produce formatted documentation. 'fop' was never a BuildRequires,
so 'xmlto' alone cannot produce any doc output. No generated
documentation appears in '%files'.

Related: rhbz#2503124

Co-Authored-By: Claude AI <noreply@anthropic.com>

libXext.spec

@@ -5,7 +5,7 @@
 Summary: X.Org X11 libXext runtime library
 Name: libXext
 Version: 1.3.6
-Release: 5%{?gitdate:.%{gitdate}git%{gitversion}}%{?dist}
+Release: 6%{?gitdate:.%{gitdate}git%{gitversion}}%{?dist}
 License: MIT-open-group AND X11 AND HPND AND HPND-sell-variant AND SMLNJ AND MIT AND ISC AND HPND-doc AND HPND-doc-sell
 URL: http://www.x.org
 
@@ -26,7 +26,6 @@ BuildRequires: libX11-devel >= 1.5.99.902
 BuildRequires: libXau-devel
 BuildRequires: xorg-x11-util-macros
 BuildRequires: autoconf automake libtool pkgconfig
-BuildRequires: xmlto
 
 %description
 X.Org X11 libXext runtime library
@@ -88,6 +87,9 @@ rm -rf $RPM_BUILD_ROOT%{_docdir}
 %{_mandir}/man3/*.3*
 
 %changelog
+* Thu Jul 16 2026 Fedora Release Engineering <releng@fedoraproject.org> - 1.3.6-6
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild
+
 * Fri Jan 16 2026 Fedora Release Engineering <releng@fedoraproject.org> - 1.3.6-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_44_Mass_Rebuild