Replace %Lu with standard %llu

Multiple scanf()s use the GNU-permitted %Lu. This is not supported in
other libraries and isn't to the POSIX specification. The L modifier
is only used for floats in POSIX.

Replacing %Lu with %llu is the same for GNU libc (scanf(3) says as much)
but means other libraries will work fine.

Closes: #19

References:
 http://pubs.opengroup.org/onlinepubs/009695399/functions/fscanf.html

proc/readproc.c

@@ -571,11 +571,11 @@ ENTER(0x160);
        "%c "
        "%d %d %d %d %d "
        "%lu %lu %lu %lu %lu "
-       "%Lu %Lu %Lu %Lu "  /* utime stime cutime cstime */
+       "%llu %llu %llu %llu "  /* utime stime cutime cstime */
        "%ld %ld "
        "%d "
        "%ld "
-       "%Lu "  /* start_time */
+       "%llu "  /* start_time */
        "%lu "
        "%ld "
        "%lu %"KLF"u %"KLF"u %"KLF"u %"KLF"u %"KLF"u "