/hg/icedtea: Fix zero build as additional VM.

[Matthias Klose]

>> diff -r 03d84febc75e -r e7ebeda31ef7 Makefile.am
>> --- a/Makefile.am       Mon Dec 21 13:40:28 2009 +0000
>> +++ b/Makefile.am       Mon Dec 21 16:42:29 2009 +0100
>> @@ -2344,7 +2344,7 @@ clean-add-cacao-debug:
>>   # configure script arguments, quoted in single quotes
>>   CONFIGURE_ARGS = @CONFIGURE_ARGS@
>>   ADD_ZERO_CONFIGURE_ARGS = \
>> -       --with-jdk-home=$(abs_top_builddir)/$(BUILD_OUTPUT_DIR)/j2sdk-image \
>> +       --with-jdk-home=$(BUILD_OUTPUT_DIR)/j2sdk-image \
>>         --disable-bootstrap --enable-zero
>>   if ADD_SHARK_BUILD
>>   ADD_ZERO_CONFIGURE_ARGS += \
>>
>
> Why does this fail?  I can't see a problem with the above setting.

BUILD_OUTPUT_DIR itself is prefixed with abs_top_builddir, not sure why, but 
this is different from icedtea6.