Add Makefile for generating extcmd_test when it doesn't exist

extcmd_test contains the external-command parser from icinga-core
and allows the commandpipe tests to check if the commands would
be accepted by the core

refs #4258

test/php/Makefile

@@ -0,0 +1,6 @@
+GCC=gcc
+PROGRAM=extcmd_test
+SOURCE=${PROGRAM}.c
+
+all:
+	cd bin/ && gcc ${SOURCE} -o ${PROGRAM}

test/php/runtests.sh

@@ -6,6 +6,10 @@ SCRIPTNAME=$(readlink -f $0)
 DIR=$(dirname $SCRIPTNAME)
 PHPUNIT=$(which phpunit)
 
+if [[ ! -x ./bin/extcmd_test ]]; then
+    make
+fi;
+
 if [[ ! -x $PHPUNIT ]]; then
     echo "PHPUnit not found!"
     exit 1