[PATCH] get_symbols() plugin API tweak to support --start-lib/--end-lib.

[Cary Coutant]

gold/
> 2015-02-26  Evgenii Stepanov  <eugenis@google.com>
>
>        * plugin.cc (get_symbols_v3): New function.
>        (Plugin::load): Add LDPT_GET_SYMBOLS_V3.
>        (Pluginobj::get_symbol_resolution_info): Return LDPS_NO_SYMS when using
>        new version.
>        * plugin.h (Pluginobj::get_symbol_resolution_info): Add version
>        parameter.

include/
> 2015-02-26  Evgenii Stepanov  <eugenis@google.com>
>
>        * plugin-api.h (enum ld_plugin_tag): Add LDPT_GET_SYMBOLS_V3.

I've committed this on your behalf. Thanks!

-cary