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>