Fix libXft detection in configure

OBS-URL: https://build.opensuse.org/package/show/devel:languages:tcl/tk?expand=0&rev=17

tk.spec

@@ -41,6 +41,7 @@ Source0:        %name%{version}-src.tar.bz2
 Source1:        tk-rpmlintrc
 Source2:        baselibs.conf
 Patch0:         %name.patch
+Patch1:         %name-xft.patch
 
 %description
 Tk is a graphical user interface toolkit that takes developing desktop
@@ -88,6 +89,7 @@ Authors:
 %prep
 %setup -q -n %name%version
 %patch0
+%patch1
 
 %build
 cd unix