test-json: check absolute and relative difference in floating point test

test-json: check absolute and relative difference in floating point test

The test fails under valgrind, so there was an exception for valgrind.
Unfortunately that check only works when valgrind-devel headers are
available during build. But it is possible to have just valgrind installed,
or simply install it after the build, and then "valgrind test-json" would
fail.

It also seems that even without valgrind, this fails on some arm32 CPUs.
Let's do the usual-style test for absolute and relative differences.

(cherry picked from commit aa70783f55b369521b94e0985e84bbdaae16b174)
(cherry picked from commit 88938bf95b850849d075d7a6ebe37bb1d9780efe)

Gbp-Pq: Name test-json-check-absolute-and-relative-difference-in-float.patch