Correct the order of check-abidump (GH-27230)

The check was backwards so we were not correctly detecting removals.

Author: pablogsal

Makefile.pre.in

@@ -762,7 +762,7 @@ 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 $(srcdir)/Doc/data/python$(LDVERSION).abi "libpython$(LDVERSION).so" --drop-private-types --no-architecture --no-added-syms
 
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 # Regenerate all generated files