subprojects: enable proper cross-compile on MinGW of certain crates

The virtgpu_kumquat deps -- used by gfxstream -- don't work
with cross-compile.  This is because they set "native: true" even
for host machine deps.

In addition, some proc-macro deps (which need "native: true") try
to link against host machine deps.

Reviewed-by: David Gilhooley <djgilhooley.gmail.com>

subprojects/packagefiles/thiserror-impl-2-rs/meson.build

@@ -21,5 +21,5 @@ lib = rust.proc_macro(
 )
 
 dep_thiserror_impl = declare_dependency(
-  link_with : [lib, syn, quote, proc_macro2]
+  link_with : [lib]
 )