Fix for enums with initialization

[mingodad]

There is a bug in squirrel on enums with initialization see the example bellow:

enum option_type { OPT_FLAG=1,  OPT_INT,  OPT_DBL,  OPT_STR,
         OPT_FFLAG, OPT_FINT, OPT_FDBL, OPT_FSTR};

print("\nOPT_FLAG " + option_type.OPT_FLAG);
print("\nOPT_INT " + option_type.OPT_INT);
print("\nOPT_DBL " + option_type.OPT_DBL);

Without the fix the output is:

OPT_FLAG 1
OPT_INT 0
OPT_DBL 1

With the fix:

OPT_FLAG 1
OPT_INT 2
OPT_DBL 3

Cheers !