gyp: inherit CC/CXX for CC/CXX.host #908
Merged
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Gyp defaults to gcc/g++ if CC.host/CXX.host is unset. This is not
suitable for environments that only uses the clang toolchain.
Since we already assume that the user will provide clang/clang++
through CC/CXX, lean against it (then drop to gcc/g++).
Refs: nodejs/node#6173
/cc @jbergstroem