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

[Sandra Loosemore]

The testcase gdb.base/gdbhistsize-history.exp checks to see whether GDB 
pays attention to the environment variable GDBHISTSIZE.  But, setting 
the environment variable in the .exp script doesn't work when the host 
GDB is running on is remote (think of the case where gdb_start runs a 
ssh command to a remote host to invoke GDB).  It seems best just to skip 
this set of tests in this case.

OK to commit?

-Sandra

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