Log Message:
(math/R-intervals) Updated 0.15.4.to 0.15.5

0.15.5
 - The commit log from 0.15.3 to 0.15.4 was wrong, citing old file named NEWS
   please ignore
 - No explict ChangeLog, but diff -urN from previous version shows:
     -Packaged: 2023-06-27 10:00:08 UTC; edzer
     +Packaged: 2024-08-23 10:51:00 UTC; edzer
 . +#include <cmath>
 . Add Rf_ prefix on function