A patch for libdl bug.

[Ulrich Drepper]

"H . J . Lu" <hjl@valinux.com> writes:

> This patch applies to elf/dlerror.c in glibc 2.1 and dlfcn/dlerror.c
> in glibc 2.2. I am enclosing a testcase here.

Thanks, I've applied the test.  I also checked in the test case,
slightly modified.

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