Merged in changes from PRE101 in the prerelease branch.

Merged in changes from PRE101 in the prerelease branch.
Specifically, this updates libtool to version 1.5 and adds the following:
	- Added the -only-static option that we added in our previous libtool.
	- Modified the autoconf macros so that libtool uses the -G option when
	  linking on Solaris.  This allows libraries with global variables with
	  constructors to automatically run those constructors when the
	  library is dlopened().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7171 91177308-0d34-0410-b5e6-96231b3b80d8