Don't add pkgconfig provides to python2-gobject-devel

This makes sure dnf prefers python3-gobject-devel over
python2-gobject-devel when using pkgconfg() BuildRequires in other
packages.

pygobject3.spec

@@ -6,7 +6,7 @@
 
 Name:           pygobject3
 Version:        3.34.0
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Python bindings for GObject Introspection
 
 License:        LGPLv2+ and MIT
@@ -22,6 +22,11 @@ BuildRequires:  python2-cairo-devel >= %{pycairo_version}
 BuildRequires:  python3-devel >= %{python3_version}
 BuildRequires:  python3-cairo-devel >= %{pycairo_version}
 
+# Don't use automatic provides in order to prefer python3-gobject-devel over
+# python2-gobject-devel. The provides are added to python3-gobject-devel
+# manually down below.
+%global __provides_exclude_from ^%{_libdir}/pkgconfig/pygobject-3\\.0\\.pc$
+
 %description
 The %{name} package provides a convenient wrapper for the GObject library
 for use in Python programs.
@@ -89,6 +94,9 @@ Requires:       gobject-introspection-devel%{?_isa}
 # Renamed in F31
 Obsoletes:      pygobject3-devel < 3.34.0-2
 Provides:       pygobject3-devel = %{version}-%{release}
+# Manually add pkgconfig provides to the python3-gobject-devel subpackage (but
+# not to python2 where they are filtered out)
+Provides:       pkgconfig(pygobject-3.0) = %{version}
 
 %description -n python3-gobject-devel
 This package contains files required to embed PyGObject
@@ -150,6 +158,9 @@ popd
 %{_libdir}/pkgconfig/pygobject-3.0.pc
 
 %changelog
+* Wed Sep 25 2019 Kalev Lember <klember@redhat.com> - 3.34.0-3
+- Don't add pkgconfig provides to python2-gobject-devel
+
 * Sat Sep 21 2019 Kalev Lember <klember@redhat.com> - 3.34.0-2
 - Drop Python 3 conditionals
 - Split pygobject3-devel into python2-gobject-devel and python3-gobject-devel