[testsuite, committed] fix shared library load in gdb.base/global-var-nested-by-dso.exp

[Sandra Loosemore]

This patch fixes a problem I saw in remote-host testing where GDB could 
not find the shared libraries for this testcase.  It was missing a call 
to gdb_load_shlibs to do that, and I think adding one is sufficiently 
obvious that I've gone ahead and committed this patch.

-Sandra

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