Modernize build.xml

Summary:
Switch tools declared in composer.json from system to Composer version.
That fixes compatibility issues, and .phar packaging issues.

Run correctly phpunit so build.xml can also be used in local,
not only on Jenkins loading dynamically XDebug.

Ref T1731.

Test Plan: `ant`

Reviewers: DorianWinty

Reviewed By: DorianWinty

Maniphest Tasks: T1731

Differential Revision: https://devcentral.nasqueron.org/D2683

Author: dereckson

build.xml

@@ -2,22 +2,15 @@
 <project name="notifications" default="full-build">
  <!-- By default, we assume all tools to be on the $PATH -->
  <property name="composer" value="composer"/>
- <property name="pdepend" value="pdepend"/>
  <property name="phpcpd"  value="phpcpd"/>
- <property name="phpcs"   value="phpcs"/>
  <property name="phpdox"  value="phpdox"/>
  <property name="phploc"  value="phploc"/>
- <property name="phpmd"   value="phpmd"/>
- <property name="phpunit" value="phpunit"/>
 
- <!-- Use this when the tools are managed by Composer in ${basedir}/vendor/bin
+ <!-- Some tools are managed by Composer. -->
  <property name="pdepend" value="${basedir}/vendor/bin/pdepend"/>
- <property name="phpcpd"  value="${basedir}/vendor/bin/phpcpd"/>
  <property name="phpcs"   value="${basedir}/vendor/bin/phpcs"/>
- <property name="phpdox"  value="${basedir}/vendor/bin/phpdox"/>
- <property name="phploc"  value="${basedir}/vendor/bin/phploc"/>
  <property name="phpmd"   value="${basedir}/vendor/bin/phpmd"/>
- <property name="phpunit" value="${basedir}/vendor/bin/phpunit"/> -->
+ <property name="phpunit" value="${basedir}/vendor/bin/phpunit"/>
 
  <target name="full-build"
          depends="prepare,static-analysis,phpunit,phpdox,-check-failure"
@@ -233,7 +226,10 @@
          unless="phpunit.done"
          depends="prepare"
          description="Run unit tests with PHPUnit">
-  <exec executable="${phpunit}" resultproperty="result.phpunit" taskname="phpunit">
+  <exec executable="php" resultproperty="result.phpunit" taskname="phpunit">
+   <arg value="-dzend_extension=xdebug.so" />
+   <arg value="-dxdebug.mode=coverage" />
+   <arg value="${phpunit}" />
    <arg value="--configuration"/>
    <arg path="${basedir}/phpunit.xml"/>
   </exec>