Pass -Og to EXTRA_CFLAGS as well as to CFLAGS_NODIST

- to CFLAGS_NODIST to take precedence as CFLAGS_NODIST go after EXTRA_CFLAGS
 - to EXTRA_CFLAGS to "bake it in" and build extension modules with -Og
 - call make regen-all with the same flags, as it invokes gcc as well

python3.spec

@@ -683,14 +683,15 @@ BuildPython() {
   $ExtraConfigArgs \
   %{nil}
 
+%global flags_override EXTRA_CFLAGS="$MoreCFlags" CFLAGS_NODIST="$CFLAGS_NODIST $MoreCFlags"
+
 %if %{without bootstrap}
   # Regenerate generated files (needs python3)
-  %make_build regen-all PYTHON_FOR_REGEN="python%{pybasever}"
+  %make_build %{flags_override} regen-all PYTHON_FOR_REGEN="python%{pybasever}"
 %endif
 
-
   # Invoke the build
-  %make_build CFLAGS_NODIST="$CFLAGS_NODIST $MoreCFlags"
+  %make_build %{flags_override}
 
   popd
   echo FINISHED: BUILD OF PYTHON FOR CONFIGURATION: $ConfName