Allow potrace as an alternative to autotrace

Both autotrace and potrace are supported for bitmap to vector graphics
conversion.  For flatpaks, potrace is preferred because it is standalone
compared to autotrace which (through ImageMagick and pstoedit) has a
large dependency tree.

fontforge.spec

@@ -2,7 +2,7 @@
 
 Name:           fontforge
 Version:        20230101
-Release:        6%{?dist}
+Release:        7%{?dist}
 Summary:        Outline and bitmap font editor
 
 License:        GPL-3.0-or-later
@@ -12,7 +12,7 @@ Source0:        https://github.com/fontforge/%{name}/archive/%{version}.tar.gz#/
 Patch0:         0001-Fix-errors-in-French-and-Italian-translations.patch
 
 Requires:       xdg-utils
-Requires:       autotrace
+Requires:       (autotrace or potrace)
 Requires:       hicolor-icon-theme
 
 BuildRequires:  gcc-c++
@@ -126,6 +126,9 @@ popd
 %doc %{_pkgdocdir}
 
 %changelog
+* Tue Aug 08 2023 Yaakov Selkowitz <yselkowi@redhat.com> - 20230101-7
+- Allow potrace as an alternative to autotrace
+
 * Wed Jul 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 20230101-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild