Progress on Wine CI support, MinGW dev shell with Meson (#10975)

* Only build perl subproject on Linux

* Fix various Windows regressions

* Don't put the emulator hook in test builds

  We run the tests in a separate derivation. Only need it for the dev shell.

* Fix native dev shells

* Fix cross dev shells we don't know how to emulate

Co-authored-by: PoweredByPie <poweredbypie@users.noreply.github.com>
Co-authored-by: Joachim Schiele <js@lastlog.de>
Co-authored-by: John Ericson <John.Ericson@Obsidian.Systems>

src/libexpr-c/nix_api_value.cc

@@ -14,7 +14,7 @@
 #include "nix_api_value.h"
 #include "value/context.hh"
 
-#ifdef HAVE_BOEHMGC
+#if HAVE_BOEHMGC
 #  include "gc/gc.h"
 #  define GC_INCLUDE_NEW 1
 #  include "gc_cpp.h"
@@ -131,7 +131,7 @@ PrimOp * nix_alloc_primop(
     try {
         using namespace std::placeholders;
         auto p = new
-#ifdef HAVE_BOEHMGC
+#if HAVE_BOEHMGC
             (GC)
 #endif
                 nix::PrimOp{