use versionized Python interpreter path

gimp.spec

@@ -473,8 +473,10 @@ ln -snf gimprc-%{binver}.5 %{buildroot}/%{_mandir}/man5/gimprc.5
 # to the system python interpreter, but this will avoid false alarms.
 grep -E -rl '^#!\s*%{_bindir}/env\s+python' --include=\*.py "%{buildroot}" |
     while read file; do
-        sed -r '1s,^#!\s*%{_bindir}/env\s+python,#!%{__python},' -i "$file"
+        sed -r '1s,^#!\s*%{_bindir}/env\s+python,#!%{__python2},' -i "$file"
     done
+
+echo "%{__python2}=%{__python2}" >> %{buildroot}%{_libdir}/gimp/%{lib_api_version}/interpreters/pygimp.interp
 %endif
 
 %if %unstable
@@ -680,6 +682,7 @@ make check %{?_smp_mflags}
 %changelog
 * Sat Nov 10 2018 Nils Philippsen <nils@tiptoe.de>
 - remove obsolete configure options
+- use versionized Python interpreter path
 
 * Sat Nov 10 2018 Nils Philippsen <nils@tiptoe.de> - 2:2.10.8-1
 - version 2.10.8