Add missing link options to export global symbols to the _DYNAMIC section,

Add missing link options to export global symbols to the _DYNAMIC section,
allowing the kernel namelist functions to operate.  For now just make
certain static variables global instead of using linker magic to export
static variables.

Add infrastructure to allow out of band kernel memory to be accessed.  The
virtual kernel's memory map does not include the virtual kernel executable
or data areas.

vmstat, systat, pstat, and netstat now work with virtual kernels.