* elf/Makefile: Add no modules for nodelete test.
* elf/nodelmod3.c: New file.
* elf/nodelmod4.c: New file.
* elf/nodelete.c: Also test case where dependency of dlopen() object
is marked nodelete.
* elf/nodlopen.c: New file.
* elf/nodlopenmod.c: New file.