Sync plugin-api.h with gold patch : http://sourceware.org/ml/binutils/2012-08/msg0044...

Sync plugin-api.h with gold patch : sourceware.org/ml/binutils/2012-08/msg00447.html

	* plugin-api.h (ld_plugin_allow_unique_segment_for_sections):
	New interface.
	(ld_plugin_unique_segment_for_sections): New interface.
	(LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS): New enum val.
	(LDPT_UNIQUE_SEGMENT_FOR_SECTIONS): New enum val.
	(tv_allow_unique_segment_for_sections): New member.
	(tv_unique_segment_for_sections): New member.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@190654 138bc75d-0d04-0410-961f-82ee72b054a4