clover: Fix build after clang r370122.

invocation.cpp:203:81: error: no matching function for call to ‘clang::CompilerInvocation::CreateFromArgs(clang::CompilerInvocation&, const char* const*, const char* const*, clang::DiagnosticsEngine&)’
              c->getInvocation(), copts.data(), copts.data() + copts.size(), diag))
                                                                                 ^

Signed-off-by: Vinson Lee <vlee@freedesktop.org>
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