skip setting the svr4 shared library breakpoint if there's no execution (Re: Regression loading a tracefile in 7_3)

[Joel Brobecker]

> 2011-05-20  Pedro Alves  <pedro@codesourcery.com>
> 
> 	gdb/
> 	* solib-svr4.c (svr4_solib_create_inferior_hook): Skip setting
> 	shared library event breakpoint if there's no execution.
> 
> 	gdb/testsuite/
> 	* gdb.trace/tfile.exp: Add test that opening the basic.tf trace
> 	file doesn't error, using MI.

Seems very reasonable...

-- 
Joel