targets except some specific ones that are known to not support signals.
Also clean up formatting.
* gdb.base/Makefile.in (EXECUTABLES): Remove sigall and signals.
(signals, sigall): Remove rules to build.
* gdb.base/{sigall.c, sigall.exp, signals.c, signals.exp}:
Moved to new gdb.signals directory.
* gdb.signals: New test directory.
* gdb.signals/{Makefile.in, configure.in, sigall.c, sigall.exp,
signals.c signals.exp}: New or moved files.
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.
