Clean up snek-lex.c references in snek.h

These were split into snek-lex.l and snek-lex.c sections

Signed-off-by: Keith Packard <keithp@keithp.com>

snek.h

@@ -566,7 +566,7 @@ snek_func_mark(void *addr);
 void
 snek_func_move(void *addr);
 
-/* snek-lex.l */
+/* snek-lex.c */
 
 extern uint8_t snek_current_indent;
 extern char *snek_file;
@@ -577,6 +577,9 @@ extern bool snek_parse_middle;
 extern bool snek_interactive;
 extern char snek_lex_text[];
 
+token_t
+snek_lex(void);
+
 /* snek-list.c */
 
 extern snek_list_t *snek_empty_tuple;
@@ -631,13 +634,6 @@ snek_poly_t
 snek_list_build(snek_list_type_t type, snek_offset_t size, ...);
 #endif
 
-/* snek-lex.c */
-
-extern uint8_t snek_lex_indent;
-
-token_t
-snek_lex(void);
-
 /* snek-memory.c */
 
 #define SNEK_COLLECT_FULL		0