Hello,

This patch modifies GDB's build process so that the TUI code is built 
when curses is available.  Previously --enable-tui was also required.

With this patch:
	./gdb -i=tui
will start up the TUI interface.  That other post creates a program 
called "tui" program that starts the TUI by default.

Comments?  I'll look to also commit this round the 16th Feb.
Andrew