Adjust more test cases to changed output of info var/func/type

Adjust more test cases to changed output of info var/func/type

After this commit:

  b744723f57 -- Show line numbers in output for "info var/func/type"

the test cases dbx.exp and info-fun.exp yield new FAILs because two
regular expressions have not been adjusted to the changed output yet.
This is fixed.

gdb/testsuite/ChangeLog:

	* gdb.base/dbx.exp (test_whereis): Adjust regexp to added line
	number information in output of "whereis" command.
	* gdb.base/info-fun.exp: Likewise, for "info fun" command.