Update python2/3 builds

libtalloc.spec

@@ -6,6 +6,16 @@
 %global with_python2 1
 %endif
 
+%if (0%{?with_python2} == 1 && 0%{?with_python3} == 0)
+# We need to sent env PYTHON for python2 only build
+%global export_waf_python export PYTHON=%{__python2}
+%endif
+
+%if (0%{?with_python2} == 1 && 0%{?with_python3} == 1)
+# python3 is default and therefore python2 need to be set as extra-python
+%global extra_python --extra-python=%{__python2}
+%endif
+
 Name: libtalloc
 Version: 2.1.15
 Release: 1%{?dist}
@@ -91,31 +101,26 @@ Development libraries for python3-talloc
 %autosetup -n talloc-%{version} -p1
 
 %build
-
-%if 0%{?with_python3}
-PY3_CONFIG_FLAGS=--extra-python=%{__python3}
-%else
-PY3_CONFIG_FLAGS=""
-%endif
-
 # workaround for https://bugzilla.redhat.com/show_bug.cgi?id=1217376
 export python_LDFLAGS=""
 
+%{?export_waf_python}
 %configure --disable-rpath \
            --disable-rpath-install \
            --bundled-libraries=NONE \
            --builtin-libraries=replace \
            --disable-silent-rules \
-           $PY3_CONFIG_FLAGS
+           %{?extra_python}
 
 make %{?_smp_mflags} V=1
 doxygen doxy.config
 
 %check
+%{?export_waf_python}
 make %{?_smp_mflags} check
 
 %install
-
+%{?export_waf_python}
 make install DESTDIR=$RPM_BUILD_ROOT
 
 # Shared libraries need to be marked executable for