Fix builds when using CMake < v3.15 and preinstalled hiredis
#196
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CMake before version 3.15 does not support creating an
ALIAS
library for a library ofUNKNOWN
type via its commandadd_library()
.Due to other fixes we can now skip the alias step (
hiredis
->hiredis:hiredis
) when importing an already installedhiredis
library and give it correct name directly in our CMakeLists.txt.The created
hiredis:hiredis
library reference is required by CMake to be able to buildhiredis-cluster
.hiredis::hiredis_ssl
is handled in the same fashion.Fixes #173