JS: getpid is broken

c_getpid is broken with the JS backend. It breaks !10453 (merged).

Fix coming.

added Tbug javascript labels

mentioned in merge request !10454 (closed)

mentioned in merge request !10110 (closed)

changed milestone to %9.6.2

mentioned in commit 25e54003

closed with commit 2972fd66

mentioned in commit 2972fd66

mentioned in commit 5292bdf8