Re-implemented ecj support

[Thomas Fitzsimmons]

Lillian Angel wrote:
> 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.

Please update INSTALL with these new instructions.

Tom