- Compiler error- and warning-related fixes for gcc 4 build.
    - Update to enhance x86 and x86_64 gdb disassembly output so as to
        symbolically display call targets from kernel module text without
        requiring module debuginfo data.
    - Fix hole where an ia64 vmcore could be mistakenly accepted as a usable
        dumpfile on an x86_64 machine, leading eventually to a non-related
        error message.