[patch,committed] Sync include/plugin-api.h with src/

[Sriraman Tallam]

Hi all,

 This patch was approved by Ian :
http://sourceware.org/ml/binutils/2011-07/msg00136.html.  I have
synced plugin-api.h to gcc with the following patch in rev.176260


        * plugin-api.h
        (ld_plugin_section): New struct.
        (ld_plugin_get_section_count): New typedef.
        (ld_plugin_get_section_type): New typedef.
        (ld_plugin_get_section_name): New typedef.
        (ld_plugin_get_section_contents): New typedef.
        (ld_plugin_update_section_order): New typedef.
        (ld_plugin_allow_section_ordering): New typedef.
        (LDPT_GET_SECTION_COUNT): New enum value.
        (LDPT_GET_SECTION_TYPE): New enum value.
        (LDPT_GET_SECTION_NAME): New enum value.
        (LDPT_GET_SECTION_CONTENTS): New enum value.
        (LDPT_UPDATE_SECTION_ORDER): New enum value.
        (LDPT_ALLOW_SECTION_ORDERING): New enum value.
        (tv_get_section_count): New struct members.
        (tv_get_section_type): New struct members.
        (tv_get_section_name): New struct members.
        (tv_get_section_contents): New struct members.
        (tv_update_section_order): New struct members.
        (tv_allow_section_ordering): New struct members.

Thanks,
-Sri.