build: suppress "ignoring duplicate libraries" warning on macOS

Xcode 15, which provides the compiler toolchain for building libvirt
on macOS has switched to a new linker that warns about duplicated
"-lblah" options on the ld commandline. In practice this is impossible
to prevent in a large project, and also harmless.

Fortunately the new ld command also has an option,
-no_warn_duplicate_libraries, that supresses this harmless/pointless
warning, meson has a simple way to check if that option is supported,
and libvirt's meson.build files already have examples of adding an
option to the ld commandline if it's available.

Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>

tools/meson.build

@@ -16,6 +16,7 @@ tools_dep = declare_dependency(
     libvirt_relro
     + libvirt_no_indirect
     + libvirt_no_undefined
+    + libvirt_no_warn_duplicate_libraries
   ),
 )