alpha linux glibc2 patch from H.J. Lu

	* config/alpha/elf.h (DEFAULT_VTABLE_THUNKS): New. Defined as 1
	if USE_GNULIBC_1 is not defined.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@14975 138bc75d-0d04-0410-961f-82ee72b054a4