[cmake-developers] Improving OpenSSL version support

[Rolf Eike Beer]

Hi,

I just pushed the topic "openssl-version" to stage and would like someone to 
review it. There are 2 patches in it. The first one is an obvious bugfix and 
makes the version number detection work at all with OpenSSL 1.0.0! Currently 
the version number shown is "1..", which is fixed by the first patch.

The second one adds an additional variable, OPENSSL_VERSION_STRING, like other 
modules also have. This variable holds the complete version number, e.g. 
"1.0.0f". As an additional bonus it does not parse this version from the 
header file if we used pkg-config to get the library location, but falls back 
to that if pkg-config was not used.

I've tested this locally for all combinations and it works for me. I would 
like to hear some thought, especially about introducing the new variable. I've 
not touched the old one so the module does not change behavior. If noone 
objects I'll merge this into next at the weekend.

Eike
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