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Avoid clobbering CXX flags when compiling lua-aho-corasick

Daniel Kahn Gillmor requested to merge dkg/resolver:dkg/pass-along-CXXFLAGS into master

Without this patch, any externally-set CXXFLAGS will be discarded when compiling lua-aho-corasick.

This helps (for example) in debian, where the build system explicitly sets some useful flags for the C++ compiler in CXXFLAGS (just as it passes useful flags for the C compiler in CFLAGS).

This only became an issue when upstream lua-aho-corasick stopped passing CFLAGS to the C++ compiler (which was the right thing to do!)

Edited by Daniel Kahn Gillmor

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