Ensure the standard C99 values are available to the NetHack code base, so that
code/macros to accomplish essentially the same thing are not necessary.
CHAR_BIT Defines the number of bits in a byte.
SCHAR_MIN Defines the minimum value for a signed char.
SCHAR_MAX Defines the maximum value for a signed char.
UCHAR_MAX Defines the maximum value for an unsigned char.
CHAR_MIN Defines the minimum value for type char and its value will be equal to SCHAR_MIN if char represents negative values, otherwise zero.
CHAR_MAX Defines the value for type char and its value will be equal to SCHAR_MAX if char represents negative values, otherwise UCHAR_MAX.
MB_LEN_MAX Defines the maximum number of bytes in a multi-byte character.
SHRT_MIN Defines the minimum value for a short int.
SHRT_MAX Defines the maximum value for a short int.
USHRT_MAX Defines the maximum value for an unsigned short int.
INT_MIN Defines the minimum value for an int.
INT_MAX Defines the maximum value for an int.
UINT_MAX Defines the maximum value for an unsigned int.
LONG_MIN Defines the minimum value for a long int.
LONG_MAX Defines the maximum value for a long int.
ULONG_MAX Defines the maximum value for an unsigned long int.
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