* gdb.base/step-test.exp: Accept stopping in memcpy/bcopy when we
have debugging info for those functions and the compiler uses them
internally to copy structs around.
* gdb.base/miscexprs.exp: Change patterns to match GDB's
actual output formatting.
* gdb.base/smoke.exp: GDB removes leading 0's.
* gdb.base/volatile.exp: Don't check type of remuneration;
that variable is no longer defined in constvars.c.
* gdb.base/step-test.c (main): Exit with explicit exit code.
* gdb.base/step-test.exp: Remove two nexti checks--they are
not portable.
