* doc/install.texi (Specific): Avoid using asterisks in @anchor

	names related to target triplets.
	Remove i?86-*-esix from platform directory.
	Remove powerpc-*-eabiaix from platform directory.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@98227 138bc75d-0d04-0410-961f-82ee72b054a4