Add syntax-check to make sure Python files don't contain trailing semicolon

We allow for a trailing semicolon in full line comments since
docs/index.py has some SQL statements in it.

cfg.mk

@@ -702,6 +702,13 @@ sc_require_enum_last_marker:
 	  { echo '$(ME): enum impl needs to use _LAST marker' 1>&2;	\
 	    exit 1; } || :
 
+# In Python files we don't want to end lines with a semicolon like in C
+sc_prohibit_semicolon_at_eol_in_python:
+	@prohibit='^[^#].*\;$$'			                        \
+	in_vc_files='\.py$$'						\
+	halt="Don't use semicolon at eol in python files"		\
+	  $(_sc_search_regexp)
+
 # We don't use this feature of maint.mk.
 prev_version_file = /dev/null