[CMake] Forward OPENSSL_ROOT_DIR
to builtin xrootd
#15697
Merged
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It was tested that this works by building openssl on Arch Linux in a random directory and setting this as the
OPENSSL_ROOT_DIR
.Then, I checked in the cache for the xrootd builtin external project if openssl was found in the desired location:
This was the case indeed.
Closes #10075.