MFH: r463695
devel/nspr: update to 4.19 (nop)
From upstream ChangeLog:
- Update NSPR to build with Android NDK r16
- Add missing include for SIZE_MAX
- Use atexit() to register _PR_Fini on OSX
Changes: https://hg.mozilla.org/projects/nspr/shortlog/NSPR_4_19_RTM
ABI: https://abi-laboratory.pro/tracker/timeline/nspr/
Approved by: ports-secteam (riggs)