Describe the bug
static_library() either completely ignore the
dependency, or says its not a static library.

To Reproduce

ASFILES = [ 'int23.S', 'int0.S', 'asm.S', sfiles ]
libdjs = dependency('dj64static', static: true)
lib = static_library('dummy', ASFILES,
  link_whole: libdjs)

This results in:

meson.build:106:6: ERROR: <PkgConfigDependency dj64static: True None> is not a static library.

If instead of the link_whole we use

lib = static_library('dummy', ASFILES,
  dependencies: libdjs)

then configuration passes, but the
dependencies is completely ignored.

Expected behavior
libdummy.a should be linked with the
library pointed by libdjs.