Add ignore file for the abidump check (GH-25323)

Author: pablogsal

Doc/data/python3.9.abi.ignorefile

@@ -0,0 +1,8 @@
+[suppress_type]
+name_regexp = _Py.*
+
+[suppress_variable]
+name_regexp = _Py.*
+
+[suppress_function]
+name_regexp = _Py.*

Makefile.pre.in

@@ -759,7 +759,9 @@ regen-abidump: all
 	@$(UPDATE_FILE) $(srcdir)/Doc/data/python$(LDVERSION).abi $(srcdir)/Doc/data/python$(LDVERSION).abi.new
 
 check-abidump: all
-		abidiff "libpython$(LDVERSION).so" $(srcdir)/Doc/data/python$(LDVERSION).abi --drop-private-types --no-architecture --no-added-syms
+		abidiff "libpython$(LDVERSION).so" $(srcdir)/Doc/data/python$(LDVERSION).abi --drop-private-types \
+		--suppressions $(srcdir)/Doc/data/python$(LDVERSION).abi.ignorefile \
+		--no-architecture --no-added-syms
 
 ############################################################################
 # Regenerate all generated files