gdb/testsuite/

gdb/testsuite/
	* gdb.base/break-interp-lib.c: Include unistd.h, assert.h and stdio.h.
	(libfunc): New parameter action.  Implement also selectable "sleep".
	* gdb.base/break-interp-main.c: Include assert.h.
	(libfunc): New parameter action.
	(main): New parameters argc and argv.  Assert argc.  Pass argv.
	* gdb.base/break-interp.exp (test_core): Pass the "segv" argument.
	(test_attach): New proc.
	(test_ld): Pass new "segv" exec parameter.  Call also test_attach.
	* lib/gdb.exp (core_find): New parameter arg.  Pass it to $binfile.