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symbol_t: fix the fields ordering vs gensym_t

This has caused issues with bounded comparison, detected by
memory sanitizer as unitialized memory access.
Add a note so it's less tempting to repeat the same mistake.

--- a/flisp.h

+++ b/flisp.h

@@ -57,11 +57,13 @@

 	value_t cdr;

 }cons_t;

+// NOTE: symbol_t MUST have the same fields as gensym_t first

+// there are places where gensyms are treated as normal symbols

 typedef struct {

-	const char *name;

-	value_t binding;   // global value binding

 	fltype_t *type;

+	value_t binding;   // global value binding

 	uint32_t hash;

+	const char *name;

 	uint8_t numtype;

 	uint8_t size;

 	uint8_t flags;