[patch/rfc, rfa:doco] Deprecate NEED_TEXT_START_END

[Joel Brobecker]

> This patch boots the NEED_TEXT_START_END code out of "exec.c" and into 
> HP/UX native.  "exec.c" now calls DEPRECATED_HPUX_TEXT_END() when defined.
> 
> Note that I've not built this on HP/UX.

I did build the hppa64 debugger recently, and the test results were
still good. :).

-- 
Joel