Sync include/plugin-api.h with binutils.

Sync include/plugin-api.h with binutils.

2016-03-03  Than McIntosh <thanm@google.com>

	* plugin-api.h: Add new hooks to the plugin transfer vector to
	to support querying section alignment and section size.
	(ld_plugin_get_input_section_alignment): New hook.
	(ld_plugin_get_input_section_size): New hook.
	(ld_plugin_tag): Add LDPT_GET_INPUT_SECTION_ALIGNMENT
	and LDPT_GET_INPUT_SECTION_SIZE.
	(ld_plugin_tv): Add tv_get_input_section_alignment and
	tv_get_input_section_size.

2016-03-03  Evgenii Stepanov  <eugenis@google.com>

	* plugin-api.h (enum ld_plugin_tag): Add LDPT_GET_SYMBOLS_V3.

From-SVN: r233986