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The new detection method also allows to enable librtmp without using
OpenSSL as a curl TLS backend at the same time.
Also:
Version info is in hex. With CMake 3.13 and newer, extract it as a hex
number. With earlier CMake version, just strip the leading zeroes.
Doing more here seems overkill because librtmp has been standing
at 2.3/2.4 for a decade now. Bumping into hex digits seems unlikely
before deprecating CMake 3.13 support.
librtmp advertises v2.4 via its
pkg-config
module, and v2.3 viaits public header. The latter shows up in
curl -V
and either canbe shown at configure-time depending on detection method.
This isn't a curl bug.
librtmp
is also affected (in CI too), because it depends on libssl andlibcrypto.