[New] `nvm install -s`: Use clang as C/C++ compiler if detected.
[New] `nvm install -s`: Use clang as C/C++ compiler if detected.

Fixes #902.

creationix/nvm,ljharb/nvm,evocateur/nvm,edwmurph/nvm,PeterDaveHelloKitchen/nvm,PeterDaveHello/nvm,creationix/nvm,edwmurph/nvm,PeterDaveHelloKitchen/nvm,ljharb/nvm,PeterDaveHello/nvm,evocateur/nvm