Re-implemented ecj support

[Lillian Angel]

Hi,

I have just added ecj support back into IcedTea.

To build with ecj and bootstrap:
./configure && make

To bootstrap with an old IcedTea build:
./configure --with-icedtea [/usr/lib/jvm/java-icedtea] && make
OR
./configure --with-icedtea-home=/path/to/icedtea && make

Use --with-gcj-home=/path/to/gcj to specify where gcj is installed, 
default location is /usr/lib/jvm/java-gcj. This is needed to link a 
few corba libs using libgcj.


Other than that, everything should work fine. If there are any bugs, 
please contact me asap.

Cheers,
Lillian