* g++.dg/abi/thunk3.C, g++.dg/abi/thunk4.C: Gate on

	dg-require-weak.  Adjust regexp to handle leading-underscore
	targets, NO_DOT_IN_LABEL targets and space as well as TAB after
	.weak.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@109286 138bc75d-0d04-0410-961f-82ee72b054a4