javac.debug proprety is not used during java compilation

Seems that the flag on whether or not to compile with debugging turned on is set incorrectly in core/build.xml file

The current value for the javac.debug property is "yes", but it should actually be set to "true" according to ant javac task:

• <property name="javac.debug" value="yes" />
  + <property name="javac.debug" value="true" />

Subsequently, when it's used later in the do_compile macro it's referenced incorrectly:

• <javac destdir="@ {output}" debug="@{javac.debug}" memoryMaximumSize="128m" fork="yes">
  + <javac destdir="@{output}

  " debug="$

  {javac.debug}

  " memoryMaximumSize="128m" fork="yes">

Since it's not passed as parameter, shouldn't the property just be accessed directly?

patch file attached.