Our current loop creates a local dependency, only to discard it. Instead
it should be overriding the proper dependency variables, via set_variable()

As-is we end-up linking against the libraries, where some are discarded
by the linker, since meson uses `-Wl,--as-needed' by default.

With this fixed, issues like 2c335972
become apparent, instead of being masked out.

Fixes: b6d94483

 ("meson: use include/compile_args dependencies")
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>