Compiling dynamic library but not its dependencies with specific dflags

[Per Nordlöw via Digitalmars-d-learn]

Given shared library `X` depending on other shared libraries 
`Ys`, is it possible, using dub, to use extra `dflags` `F` when 
building the sources of `X` only and not have those extra flags 
`F` be used when (re)compiling `Ys`. In my specific case those 
flags are `-fsanitize=address` and `-cov`.