If needed, this will be done later via machdeps and not preprocessor macros

This reverts commit 1e6f9135.

It also changes pthread_t to match the usual definition on a glibc + Linux.

Prints the number of statements at which a garbled mix from a given origin
has been read and propagated, instead of the total number of times such a
garbled mix has been read/propagated.
This is more stable and depends less on states partitioning.