[patch, testsuite] skip gdb.base/gdbinit-history.exp on remote hosts

[Sandra Loosemore]

This patch is very similar to the one I posted for 
gdb.base/gdbhistsize-history.exp yesterday:

https://sourceware.org/ml/gdb-patches/2015-09/msg00355.html

The rationale is the same -- the test manipulates environment variables 
in the .exp script.  When GDB is run on a remote host it doesn't inherit 
those environment variables, so the tests cannot possibly work.

OK to commit?

-Sandra

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