Remove unneeded defines.

/*       ares/config.dos - Hand crafted config file for DOS         */

/* ================================================================ */

#if defined(DJGPP)

  #define OS  "MSDOS/djgpp"

#elif defined(__HIGHC__)

  #define OS  "MSDOS/HighC"

#elif defined(__WATCOMC__)

  #define OS  "MSDOS/Watcom"

#else

  #define OS  "MSDOS/?"

#endif

#define PACKAGE  "c-ares"

#define HAVE_FCNTL_H           1

#define HAVE_GETADDRINFO       1

#define HAVE_GETNAMEINFO       1

#define HAVE_GETPROTOBYNAME    1

#define HAVE_GETTIMEOFDAY      1

#define HAVE_IO_H              1

#define HAVE_IOCTL             1

#define HAVE_IOCTL_FIONBIO     1

#define HAVE_IOCTLSOCKET       1

#define HAVE_IOCTLSOCKET_FIONBIO   1

#define HAVE_LIMITS_H          1

#define HAVE_LOCALE_H          1

#define HAVE_LONGLONG          1

#define HAVE_MEMORY_H          1

#define HAVE_NET_IF_H          1

#define HAVE_PROCESS_H         1

#define HAVE_RECV              1

#define HAVE_RECVFROM          1

#define HAVE_SELECT            1

#define HAVE_SEND              1

#define HAVE_SETJMP_H          1

#define HAVE_SETLOCALE         1

#define HAVE_SETMODE           1

#define HAVE_SIGNAL            1

#define HAVE_SOCKET            1

#define HAVE_SPNEGO            1

#define HAVE_STRDUP            1

#define HAVE_STRICMP           1

#define HAVE_STRTOLL           1

#define HAVE_STRUCT_TIMEVAL    1

#define HAVE_STRUCT_IN6_ADDR   1

#define HAVE_STRUCT_TIMEVAL    1

#define HAVE_SYS_IOCTL_H       1

#define HAVE_SYS_SOCKET_H      1

#define HAVE_SYS_STAT_H        1

#define HAVE_SYS_TYPES_H       1

#define HAVE_TERMIOS_H         1

#define HAVE_TIME_H            1

#define HAVE_UNISTD_H          1

#define NEED_MALLOC_H          1

#define RETSIGTYPE             void

#define SIZEOF_LONG_DOUBLE     16

#define STDC_HEADERS           1

#define TIME_WITH_SYS_TIME     1

/* Qualifiers for send(), recv(), recvfrom() and getnameinfo(). */

#define RECVFROM_TYPE_RETV     int

#define RECVFROM_TYPE_ARG2_IS_VOID 1

#define GETNAMEINFO_QUAL_ARG1  const

#define GETNAMEINFO_TYPE_ARG1  struct sockaddr *

#define GETNAMEINFO_TYPE_ARG2  int

#define GETNAMEINFO_TYPE_ARG46 int

#define GETNAMEINFO_TYPE_ARG7  int

#define BSD

/* USE_ZLIB on cmd-line */

#ifdef USE_ZLIB

  #define HAVE_ZLIB_H            1

  #define HAVE_LIBZ              1

#endif

/* USE_SSLEAY on cmd-line */

#ifdef USE_SSLEAY

  #define HAVE_CRYPTO_CLEANUP_ALL_EX_DATA 1

  #define HAVE_OPENSSL_ENGINE_H  1

  #define OPENSSL_NO_KRB5        1

  #define USE_OPENSSL            1

#endif

/* to disable LDAP */

#define CURL_DISABLE_LDAP        1

#define in_addr_t  u_long

#if defined(__HIGHC__) || \

    (defined(__GNUC__) && (__GNUC__ < 4))

#define ssize_t    int

#endif

#define CURL_CA_BUNDLE  getenv("CURL_CA_BUNDLE")

/* Target HAVE_x section */

#if defined(DJGPP)

  #define HAVE_BASENAME             1

  #define HAVE_STRCASECMP           1

  #define HAVE_STRNCASECMP          1

  #define HAVE_SIGACTION            1

  #define HAVE_SIGSETJMP            1

  #define HAVE_SYS_TIME_H           1

  #define HAVE_VARIADIC_MACROS_GCC  1

  #if (DJGPP_MINOR >= 4)

    #define HAVE_STRLCAT  1

  #endif

  /* Because djgpp <= 2.03 doesn't have snprintf() etc. */

  #if (DJGPP_MINOR < 4)

    #define _MPRINTF_REPLACE