compiler warning with dec alpha compiler.
* gdb.base/commands.exp (if_while_breakpoint_command_test): Remove
extra \n from gdb_test call (this explains why the prompt test
that I removed yesterday was there).
(user_defined_command_test): Remove extra \n and prompt test.
* gdb.base/sigall.c: If SIGABRT == SIGLOST, just act as if SIGLOST
doesn't exist. Likewise if SIGIO == SIGPOLL, pretend SIGPOLL
doesn't exist.
* gdb.base/sigall.exp: Remove special handling for SIGIO and SIGPOLL.
Also remove alpha workaround, which turns out to be because
SIGABRT == SIGLOST.
