ld: Build libpr23169a.so with -z lazy

pr23169b test only works with lazy binding.  To work with linker which
disables lazy binding by default, build pr23169b binaries with -z lazy.

	PR ld/30698
	* ld-ifunc/ifunc.exp: Build pr23169b binaries with -z lazy.

(cherry picked from commit 51dd9e7c)