m4/guestfs-find-db-tool.m4: Remove unused file.

Fixes: commit 42e5e7cfdb
(cherry picked from commit 8317279c35)

m4/guestfs-find-db-tool.m4

@@ -1,43 +0,0 @@
-# libguestfs
-# Copyright (C) 2014 Red Hat Inc.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-
-AC_DEFUN([GUESTFS_FIND_DB_TOOL],[
-    pushdef([VARIABLE],$1)
-    TOOL=$2
-
-    db_tool_name="db_$TOOL"
-    db_versions="53 5.3 5.2 5.1 4.8 4.7 4.6"
-    db_tool_patterns="dbX_$TOOL dbX.Y_$TOOL"
-    db_tool_patterns="dbX_$TOOL db_$TOOL-X dbX.Y_$TOOL db_$TOOL-X.Y"
-
-    AC_ARG_VAR(VARIABLE, [Absolute path to $db_tool_name executable])
-
-    AS_IF(test -z "$VARIABLE", [
-        exe_list="db_$TOOL"
-        for ver in $db_versions ; do
-            ver_maj=`echo $ver | cut -d. -f1`
-            ver_min=`echo $ver | cut -d. -f2`
-            for pattern in $db_tool_patterns ; do
-                exe=`echo "$pattern" | sed -e "s/X/$ver_maj/g;s/Y/$ver_min/g"`
-                exe_list="$exe_list $exe"
-            done
-        done
-        AC_PATH_PROGS([]VARIABLE[], [$exe_list], [no])
-    ])
-
-    popdef([VARIABLE])
-])