Revert "Select TCP when lack of SYSV IPC"

This reverts commit 19d204548d4f141fcc8a5e494eea84282b17f4a2.

From 19d204548d4f141fcc8a5e494eea84282b17f4a2 Mon Sep 17 00:00:00 2001
From: Matt Weber <matthew.weber@rockwellcollins.com>
Date: Mon, 16 Sep 2019 22:00:29 -0500
Subject: [PATCH] Select TCP when lack of SYSV IPC

Update to add a configure test to build and install the TCP IPC version
when detecting SYSV IPC MsgQ support isn't available.

The issue was initially discovered on Windows Services for Linux
(WSL1.0). WSL does have some SysV IPC, but no message Q's, which is
required by fakeroot/faked by default.

Fixes:
https://github.com/Microsoft/WSL/issues/2465

Additional bug reports:
https://bugs.busybox.net/show_bug.cgi?id=11366

Signed-off-by: Jean-Francois Doyon <jfdoyon@gmail.com>
Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>

diff --git a/configure.ac b/configure.ac
index 73415d2..ddde5c9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,50 +26,6 @@ AC_CACHE_CHECK([which IPC method to use],
 	       [ac_cv_use_ipc],
 	       [ac_cv_use_ipc=sysv])
 
-if test $ac_cv_use_ipc = "sysv"; then
-  AC_MSG_CHECKING([whether SysV IPC message queues are actually working on the host])
-
-  AC_LANG_PUSH(C)
-  AC_RUN_IFELSE([AC_LANG_SOURCE([[
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/ipc.h>
-#include <sys/msg.h>
-#include <time.h>
-#include <unistd.h>
-
-int main() {
-
-  srandom(time(NULL)+getpid()*33151);
-  key_t msg_key = random();
-  int msg_get = msgget(msg_key, IPC_CREAT|0600);
-
-  if (msg_get==-1) {
-    return 1;
-  } else {
-    msgctl(msg_get, IPC_RMID, NULL);
-    return 0;
-  }
-
-}]])],[ac_cv_use_ipc=sysv],[ac_cv_use_ipc=tcp],[ac_cv_use_ipc=cross])
-
-  if test $ac_cv_use_ipc = cross; then
-    if test "$host_os" = linux-gnu; then
-      ac_cv_use_ipc=sysv
-      AC_MSG_RESULT([cross, guessing yes])
-    else
-      (set -o posix; set)
-      AC_MSG_ERROR([cross compiling, unknown result for $host_os])
-    fi
-  elif test $ac_cv_use_ipc = "tcp"; then
-    AC_MSG_RESULT([No, using TCP])
-  else
-    AC_MSG_RESULT([Yes])
-  fi
-
-  AC_LANG_POP(C)
-fi
-
 AC_ARG_WITH([dbformat],
 	    AS_HELP_STRING([--with-dbformat@<:@=DBFORMAT@:>@],
 			   [database format to use: either inode (default) or path]),