[commit] Fix crash when setting solib-search-path

[Vladimir Prus]

I have checked in the attached patch. It was originally posted
over a year ago:

	http://sourceware.org/ml/gdb-patches/2008-02/msg00465.html

and approved in:

	http://sourceware.org/ml/gdb-patches/2008-03/msg00297.html

It still applies, and causes no change in test results.

- Volodya

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