configure: remove CURL_CONFIGURE_CURL_SOCKLEN_T

Follow-up to #3166 which did the cmake part of this. This type/define is
not used.

Closes #3168

acinclude.m4

@@ -1776,130 +1776,6 @@ cat >>confdefs.h <<_EOF
 _EOF
 ])
 
-
-dnl CURL_CONFIGURE_CURL_SOCKLEN_T
-dnl -------------------------------------------------
-dnl The need for the curl_socklen_t definition arises mainly to properly
-dnl interface HP-UX systems which on one hand have a typedef'ed socklen_t
-dnl data type which is 32 or 64-Bit wide depending on the data model being
-dnl used, and that on the other hand is only actually used when interfacing
-dnl the X/Open sockets provided in the xnet library.
-
-AC_DEFUN([CURL_CONFIGURE_CURL_SOCKLEN_T], [
-  AC_REQUIRE([CURL_INCLUDES_WS2TCPIP])dnl
-  AC_REQUIRE([CURL_INCLUDES_SYS_SOCKET])dnl
-  AC_REQUIRE([CURL_PREPROCESS_CALLCONV])dnl
-  #
-  AC_BEFORE([$0], [CURL_CONFIGURE_PULL_SYS_POLL])dnl
-  #
-  AC_MSG_CHECKING([for curl_socklen_t data type])
-  curl_typeof_curl_socklen_t="unknown"
-  for arg1 in int SOCKET; do
-    for arg2 in 'struct sockaddr' void; do
-      for t in socklen_t int size_t 'unsigned int' long 'unsigned long' void; do
-        if test "$curl_typeof_curl_socklen_t" = "unknown"; then
-          AC_COMPILE_IFELSE([
-            AC_LANG_PROGRAM([[
-              $curl_includes_ws2tcpip
-              $curl_includes_sys_socket
-              $curl_preprocess_callconv
-              extern int FUNCALLCONV getpeername($arg1, $arg2 *, $t *);
-            ]],[[
-              $t *lenptr = 0;
-              if(0 != getpeername(0, 0, lenptr))
-                return 1;
-            ]])
-          ],[
-            curl_typeof_curl_socklen_t="$t"
-          ])
-        fi
-      done
-    done
-  done
-  for t in socklen_t int; do
-    if test "$curl_typeof_curl_socklen_t" = "void"; then
-      AC_COMPILE_IFELSE([
-        AC_LANG_PROGRAM([[
-          $curl_includes_sys_socket
-          typedef $t curl_socklen_t;
-        ]],[[
-          curl_socklen_t dummy;
-        ]])
-      ],[
-        curl_typeof_curl_socklen_t="$t"
-      ])
-    fi
-  done
-  AC_MSG_RESULT([$curl_typeof_curl_socklen_t])
-  if test "$curl_typeof_curl_socklen_t" = "void" ||
-    test "$curl_typeof_curl_socklen_t" = "unknown"; then
-    AC_MSG_ERROR([cannot find data type for curl_socklen_t.])
-  fi
-  #
-  AC_MSG_CHECKING([size of curl_socklen_t])
-  curl_sizeof_curl_socklen_t="unknown"
-  curl_pull_headers_socklen_t="unknown"
-  if test "$curl_cv_header_ws2tcpip_h" = "yes"; then
-    tst_pull_header_checks='none ws2tcpip'
-    tst_size_checks='4'
-  else
-    tst_pull_header_checks='none systypes syssocket'
-    tst_size_checks='4 8 2'
-  fi
-  for tst_size in $tst_size_checks; do
-    for tst_pull_headers in $tst_pull_header_checks; do
-      if test "$curl_sizeof_curl_socklen_t" = "unknown"; then
-        case $tst_pull_headers in
-          ws2tcpip)
-            tmp_includes="$curl_includes_ws2tcpip"
-            ;;
-          systypes)
-            tmp_includes="$curl_includes_sys_types"
-            ;;
-          syssocket)
-            tmp_includes="$curl_includes_sys_socket"
-            ;;
-          *)
-            tmp_includes=""
-            ;;
-        esac
-        AC_COMPILE_IFELSE([
-          AC_LANG_PROGRAM([[
-            $tmp_includes
-            typedef $curl_typeof_curl_socklen_t curl_socklen_t;
-            typedef char dummy_arr[sizeof(curl_socklen_t) == $tst_size ? 1 : -1];
-          ]],[[
-            curl_socklen_t dummy;
-          ]])
-        ],[
-          curl_sizeof_curl_socklen_t="$tst_size"
-          curl_pull_headers_socklen_t="$tst_pull_headers"
-        ])
-      fi
-    done
-  done
-  AC_MSG_RESULT([$curl_sizeof_curl_socklen_t])
-  if test "$curl_sizeof_curl_socklen_t" = "unknown"; then
-    AC_MSG_ERROR([cannot find out size of curl_socklen_t.])
-  fi
-  #
-  case $curl_pull_headers_socklen_t in
-    ws2tcpip)
-      CURL_DEFINE_UNQUOTED([CURL_PULL_WS2TCPIP_H])
-      ;;
-    systypes)
-      CURL_DEFINE_UNQUOTED([CURL_PULL_SYS_TYPES_H])
-      ;;
-    syssocket)
-      CURL_DEFINE_UNQUOTED([CURL_PULL_SYS_TYPES_H])
-      CURL_DEFINE_UNQUOTED([CURL_PULL_SYS_SOCKET_H])
-      ;;
-  esac
-  CURL_DEFINE_UNQUOTED([CURL_TYPEOF_CURL_SOCKLEN_T], [$curl_typeof_curl_socklen_t])
-  CURL_DEFINE_UNQUOTED([CURL_SIZEOF_CURL_SOCKLEN_T], [$curl_sizeof_curl_socklen_t])
-])
-
-
 dnl CURL_CONFIGURE_PULL_SYS_POLL
 dnl -------------------------------------------------
 dnl The need for the sys/poll.h inclusion arises mainly to properly

configure.ac

@@ -3650,8 +3650,6 @@ CURL_RUN_IFELSE(
   AC_MSG_RESULT([no])
 ])
 
-CURL_CONFIGURE_CURL_SOCKLEN_T
-
 CURL_CONFIGURE_PULL_SYS_POLL
 
 TYPE_IN_ADDR_T