[L] Change in libosmocore[master]: add jhash.h, copied from linux/jhash.h

Attention is currently required from: neels.

laforge has posted comments on this change. ( https://gerrit.osmocom.org/c/libosmocore/+/36913?usp=email )

Change subject: add jhash.h, copied from linux/jhash.h ......................................................................

Patch Set 1: Verified-1

(1 comment)

Patchset:

PS1: I thought the linter failures were in copied jhash.h code, so I manually set V+1 and removed the jenkins builder/linter. However, it's in the unit test and hence should be fixed. Adding my -1 as a replacement of the deleted verify-build.