Require xsltproc, not libxslt

The configure script checks for the xsltproc binary, and it is also what
the installed scripts require.

gtk-doc.spec

@@ -1,7 +1,7 @@
 Summary: API documentation generation tool for GTK+ and GNOME
 Name: gtk-doc
 Version: 1.24
-Release: 3%{?dist}
+Release: 4%{?dist}
 License: GPLv2+ and GFDL
 Group: Development/Tools
 #VCS: git:git://git.gnome.org/gtk-doc
@@ -12,7 +12,7 @@ URL: http://www.gtk.org/gtk-doc
 
 BuildRequires: docbook-utils
 BuildRequires: jade
-BuildRequires: libxslt
+BuildRequires: /usr/bin/xsltproc
 BuildRequires: docbook-style-xsl
 BuildRequires: python2-devel
 BuildRequires: gnome-doc-utils
@@ -23,7 +23,7 @@ BuildRequires: yelp-tools
 BuildRequires: autoconf automake libtool
 
 # Following are not automatically installed
-Requires: docbook-utils openjade libxslt docbook-style-xsl
+Requires: docbook-utils openjade /usr/bin/xsltproc docbook-style-xsl
 # we are installing an automake macro
 Requires: automake
 # we are installing an sgml catalog
@@ -65,6 +65,9 @@ mkdir -p $RPM_BUILD_ROOT%{_datadir}/gtk-doc/html
 %{_datadir}/help/*/gtk-doc-manual/
 
 %changelog
+* Thu Feb 04 2016 David King <amigadave@amigadave.com> - 1.24-4
+- Require xsltproc, not libxslt
+
 * Wed Feb 03 2016 Fedora Release Engineering <releng@fedoraproject.org> - 1.24-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_24_Mass_Rebuild