Fixed build script for VM.

Please do not remove "dir" attribute from "exec" tag for targets "phpmd" and "pdepend".
This attribute is required for pdepend to find its pdepend.xml!
If you want to change this, ask me!!!

build.vm.xml

@@ -37,7 +37,7 @@
   <!-- Generate jdepend.xml and software metrics charts -->
  <target name="pdepend">
     <touch file="${logdir}/jdepend.xml" mkdirs="true" />
-    <exec executable="pdepend">
+    <exec dir="${repodir}" executable="pdepend">
     <arg line="--jdepend-xml=${logdir}/jdepend.xml
         --ignore=language,Zend,ZendX,work,tests
         --suffix=php
@@ -51,7 +51,7 @@
  <!-- Generate pmd.xml - exclude */Zend/*,*/language/*    -->
  <target name="phpmd">
     <touch file="${logdir}/pmd.xml" mkdirs="true" />
-    <exec executable="phpmd">
+    <exec dir="${repodir}" executable="phpmd">
         <arg line="${repodir}/ xml codesize,unusedcode,design,naming
             --reportfile ${builddir}/logs/pmd.xml
             --suffixes php