Fix some header identifications
The following header files missed the shot:
- jsonfuncs.h, as of
ce0425b.
- jsonapi.h, as of
beb4699.
- llvmjit_emit.h as of
7ec0d80.
- partdesc.h, as of
1bb5e78.
Author: Jesse Zhang
Discussion: https://postgr.es/m/CAGf+fX4-8xULEOz09DE2dZGjT+q8VJ--rqfTpvcFwc+A4fc-3Q@mail.gmail.com