test-xalloc-die: avoid spurious failure due to libtool argv difference

test-xalloc-die: avoid spurious failure due to libtool argv difference

In a libtool-enabled project, this test would fail due to a difference
in the emitted program name, e.g.,
-test-xalloc-die: memory exhausted
+/tmp/.../tests/.libs/lt-test-xalloc-die: memory exhausted
Use program to avoid that.
* modules/xalloc-die-tests (Depends-on): Add progname.
* tests/test-xalloc-die.c: Include progname.h".
(program_name): Remove decl.
(main): Call set_program_name.
* tests/test-xalloc-die.sh (compare): Remove unnecessary ${EXE}.