build: Remove pointless autoconf checks.

These checks never fail on any reasonably current system and
probably have never failed on any system this software was ever
compiled. Removing the checks reduces the configure time to 60%, so..

diff --git a/configure.ac b/configure.ac
index e4010bdeb0800dbea6ac63e073264666ad0f249e..c3dd6b1f5491bb9c5bf4def2d64d754fc81ae89a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -55,54 +55,6 @@ test -z "$install" && AC_MSG_ERROR(
 AC_PROG_CC
 AC_PROG_CPP
 
-AC_HEADER_DIRENT
-AC_HEADER_STDC
-AC_HEADER_SYS_WAIT
-AC_HEADER_STDBOOL
-AC_CHECK_HEADERS([arpa/inet.h ctype.h fcntl.h limits.h netdb.h netinet/in.h \
-       stdlib.h string.h sys/socket.h sys/time.h sys/timeb.h sys/un.h \
-       sys/ipc.h unistd.h utime.h stddef.h],
-       [], [AC_MSG_ERROR([$ac_header not found])])
-
-# Checks for typedefs, structures, and compiler characteristics.
-AC_C_CONST
-AC_C_INLINE
-AC_TYPE_OFF_T
-AC_TYPE_PID_T
-AC_TYPE_SIZE_T
-AC_HEADER_TIME
-AC_STRUCT_TM
-AC_TYPE_INT8_T
-AC_TYPE_INT16_T
-AC_TYPE_INT32_T
-AC_TYPE_INT64_T
-AC_TYPE_MODE_T
-AC_TYPE_SSIZE_T
-AC_TYPE_UID_T
-AC_TYPE_UINT8_T
-AC_TYPE_UINT16_T
-AC_TYPE_UINT32_T
-AC_TYPE_UINT64_T
-
-# Checks for library functions.
-AC_FUNC_FORK
-AC_PROG_GCC_TRADITIONAL
-AC_FUNC_MEMCMP
-AC_FUNC_MKTIME
-AC_FUNC_MMAP
-AC_FUNC_SELECT_ARGTYPES
-AC_FUNC_STAT
-AC_FUNC_STRFTIME
-AC_FUNC_VPRINTF
-AC_FUNC_CLOSEDIR_VOID
-AC_FUNC_LSTAT
-
-AC_CHECK_FUNCS([atexit dup2 memchr memmove memset \
-       regcomp select strchr strdup strerror strstr strtol uname \
-       fchdir gettimeofday localtime_r munmap strcasecmp strcspn \
-       strncasecmp strrchr strspn alarm mkdir inet_ntoa socket], [],
-       [AC_MSG_ERROR([function not found, cannot live without it])])
-
 executables="recv filter audioc write afh play"
 ################################################################## clock_gettime
 clock_gettime_lib=