[patch/testsuite] gdb_file_cmd: enhance return value

[Michael Chastain]

Committed.

Bring on the new gdb.gdb/*.exp code!

===

2004-08-27  Michael Chastain  <mec.gnu@mindspring.com>

	With code from Manoj Iyer <manjo@austin.ibm.com>:
	* lib/gdb.exp (gdb_file_cmd): Return more information in the
	return value.  Add an arm for "no debugging symbols found".
	Change a stray "error" to "perror".
	(gdb_run_cmd): Adapt to new return value.
	* gdb.base/remote.exp: Adapt to new return value.
	* gdb.gdb/complaints.exp: Likewise.
	* gdb.gdb/observer.exp: Likewise.
	* gdb.gdb/selftest.exp: Likewise.
	* gdb.gdb/xfullpath.exp: Likewise.