Do not install nlohmann json if it is not embedded #177
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This fixes #175
The problem is that the
nlohmann/json.hpp
is included in the install directory even if theINJA_USE_EMBEDDED_JSON
is set toOFF
.If
nlohmann/json.hpp
comes from another place (for example, a different version than the one in thethid_party
folder), then you probably do not want to copy the embedded one it into the install directory.This PR fixes that.