[patch, testsuite] fix problems in gdb.base/paginate-bg-execution.exp

[Sandra Loosemore]

This patch addresses a couple of problems in 
gdb.base/paginate-bg-execution.exp:

(1) A different "Quit" message can appear in some cases, e.g. if GDB 
thinks the terminal doesn't support job control -- see the definition of 
quit in utils.c.  The specific situation where I tripped over this was 
running GDB in a CMD.EXE shell on a remote Windows host via ssh -T.

(2) The test was sending a ^C interrupt without testing whether the 
target had the nointerrupts property set.

OK to commit?  (I'm not sure this one qualifies as obvious.)

-Sandra

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