mi-sym-info.exp: Increase timeout for 114-symbol-info-functions

mi-sym-info.exp: Increase timeout for 114-symbol-info-functions

Loading libc.so's symbols increased the amount of time needed for
114-symbol-info-function to fetch symbols, causing a timeout during my
testing.  I enclosed the entire block with a "with_timeout_factor 4",
which fixes the problem for me.  (Using 2 also fixed it for me, but it
might not be enough when running this test on slower machines.)

gdb/testsuite/ChangeLog:

	* gdb.mi/mi-sym-info.exp (114-symbol-info-function test): Increase
	timeout.