Precompiled NIFs do not work on Fedora and Red Hat machines

[Benjamin-Philip]

This is because redhat uses the following target x86_64-redhat-linux. Other than a change in OS target variant and the missing "gnu" suffix, there is (as far as I know) no difference between x86_64-redhat-linux and x86_64-unknown-linux-gnu.

Possible solutions include:

• Adding the redhat target to the default list
• Changing the target validation logic to conform to a regex instead of a concrete list of targets
• Writing documentation warning users to add the redhat and other such targets to builds.

Personally I prefer the 2nd option.

[philss]

I would use a list in the normalization code to treat "redhat" as "unknown". WDYT?

[Benjamin-Philip]

Sounds great! I'll send a PR.