Use of OPENWIN_HOME on linux

[David Holmes]

It used to be in JDK6 that you could use ALT_OPENWIN_HOME to override 
the default OPENWIN_HOME settings in the makefiles for the j2se 
workspace. But now in JDK7 this has gone and the value is hardwired in 
Defs-linux.gmk:

override  OPENWIN_HOME  =/usr/X11R6/

Can someone tell me why this change was made? It seems to go against the 
normal policy of using the ALT_* variables to customize settings.

This value needs to be overridden externally when doing cross-compilation.

Thanks,
David