Kefu Chai 16fd07244d cmake: allow use libzstd in system ... since we are moving the test nodes from bionic to focal, we are able to use the prebuilt libzstd libraries when running "make check". to speed up the build and test, in this change: * add FindZstd.cmake which allows us to use the libzstd in system * extract BuildZstd.cmake for better readability * add an option named "WITH_SYSTEM_ZSTD", which defaults to "OFF", so user can enable it on demand. Signed-off-by: Kefu Chai <kchai@redhat.com>		2021-03-31 12:53:39 +08:00
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modules	cmake: allow use libzstd in system	2021-03-31 12:53:39 +08:00