%python_provide: Don't try to obsolete %_isa provides

Based on recent changes in 04769fa014,
packagers might want to use:

    %{?python_provide:%python_provide python2-foo%{?_isa}}

...for backwards compatibility. However the macro adds obsoletes and
since RPM 4.15, obsoletes with %{?_isa} are not possible:

    Only package names are allowed in Obsoletes: Obsoletes: python-foo(x86-64) < ...

To allow such usage, %python_provide now only obsoletes if the argument
does not end with ")".

macros.python

@@ -53,11 +53,13 @@
     print(string.sub(package,9,string.len(package)))
     print(" = ")
     print(vr)
-    --Obsoleting the previous default python package
-    print("\\nObsoletes: python-")
-    print(string.sub(package,9,string.len(package)))
-    print(" < ")
-    print(vr)
+    --Obsoleting the previous default python package (if it doesn't have isa)
+    if (string.sub(package, "-1") ~= ")") then
+      print("\\nObsoletes: python-")
+      print(string.sub(package,9,string.len(package)))
+      print(" < ")
+      print(vr)
+    end
   elseif (string.starts(package, "python" .. rpm.expand("%{python3_pkgversion}") .. "-")) then
     --No unversioned provides as python3 is not default
   elseif (rpm.expand("%{?python3_other_pkgversion}") ~= "" and string.starts(package, "python" .. rpm.expand("%{python3_other_pkgversion}") .. "-")) then

python-rpm-macros.spec

@@ -1,6 +1,6 @@
 Name:           python-rpm-macros
 Version:        3
-Release:        44%{?dist}
+Release:        45%{?dist}
 Summary:        The unversioned Python RPM macros
 
 License:        MIT
@@ -73,6 +73,9 @@ install -m 644 %{SOURCE0} %{SOURCE1} %{SOURCE2} %{SOURCE3} %{SOURCE4} \
 
 
 %changelog
+* Tue Jul 09 2019 Miro Hrončok <mhroncok@redhat.com> - 3-45
+- %%python_provide: Don't try to obsolete %%_isa provides
+
 * Mon Jun 17 2019 Miro Hrončok <mhroncok@redhat.com> - 3-44
 - Make %%__python /usr/bin/python once again until we are ready