Change fixed postconf to a variable for cross-compiling

Upstreamstatus: Inappropriate [embedded specific]

Signed-off-by: Yao Zhao <yao.zhao@windriver.com>
---
diff --git a/postfix-install b/postfix-install
index 49225ac..2e4c292 100644
--- a/postfix-install
+++ b/postfix-install
@@ -201,8 +201,8 @@ test -z "$non_interactive" -a ! -t 0 && {
     exit 1
 }
 
-test -x bin/postconf || {
-    echo $0: Error: no bin/postconf file. Did you forget to run \"make\"? 1>&2
+test -x "$POSTCONF" || {
+    echo $0: Error: no $POSTCONF file. Did you forget to run \"make\"? 1>&2
     exit 1
 }
 
@@ -363,7 +363,7 @@ HTML files. Specify \"no\" if you do not want to install these files."
 
 : ${install_root=/}
 : ${tempdir=`pwd`}
-: ${config_directory=`bin/postconf -c conf -h -d config_directory`}
+: ${config_directory=`$POSTCONF -c conf -h -d config_directory`}
 
 # Find out the location of installed configuration files.
 
@@ -433,7 +433,7 @@ test -f $CONFIG_DIRECTORY/main.cf && {
 	case "$junk" in
 	"") eval unset $name;;
 	esac
-	eval : \${$name=\`bin/postconf -c $CONFIG_DIRECTORY -h $name\`} ||
+	eval : \${$name=\`$POSTCONF -c $CONFIG_DIRECTORY -h $name\`} ||
 	    exit 1
     done
 }
@@ -446,7 +446,7 @@ do
     case "$junk" in
     "") eval unset $name;;
     esac
-    eval : \${$name=\`bin/postconf -c conf -d -h $name\`} || exit 1
+    eval : \${$name=\`$POSTCONF -c conf -d -h $name\`} || exit 1
 done
 
 # Override settings manually.
@@ -565,6 +565,8 @@ HTML_DIRECTORY=$install_root$html_directory
 MANPAGE_DIRECTORY=$install_root$manpage_directory
 README_DIRECTORY=$install_root$readme_directory
 
+test "x$POSTCONF" != "x" || POSTCONF="bin/postconf"
+
 # Avoid repeated tests for existence of these; default permissions suffice.
 
 test -d $DAEMON_DIRECTORY || mkdir -p $DAEMON_DIRECTORY || exit 1
@@ -724,7 +726,7 @@ do
 # Postfix releases, and software should not suddenly be installed in
 # the wrong place when Postfix is being upgraded.
 
-bin/postconf -c $CONFIG_DIRECTORY -e \
+"$POSTCONF" -c $CONFIG_DIRECTORY -e \
     "daemon_directory = $daemon_directory" \
     "data_directory = $data_directory" \
     "command_directory = $command_directory" \