Dynamically linking hiredis for redis no longer works; exported symbols renamed/missing

[KennethWilke]

I'm working on an embedded platform that dynamically links hiredis when building redis itself, which does not seem to work after the name changes to SDS. Attempts to build Redis with dynamically linked hiredis now returns errors such as:

ld: redis-benchmark.o: in function `freeRedisConfig':
redis/src/redis-benchmark.c:383: undefined reference to `hi_sdsfree'

This was tested with redis 6.2.6 and with hiredis 1.0.2

It looks to me like the sdscompat.h header was added the redis repo only, and should be included in hiredis proper as well.