Remove unused tools (crash kernel and vmcore).
Replace "%Lx" scanf formatting with "%"SCNxPTR in /proc/iommem
reading code. This might be a musl bug since it works with glibc
sscanf.
This resolves issue #73 by replacing the use of log10() with
an integer version so that -lm is no longer required.
The parts of dmsetup that we use don't need threads, so
-lpthreads is removed from the link line.