unittests: Move conditional include out of wasm section

Change-Id: I2150c83eeb8939801aeed7e7bb0aec92f8f91733
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3227756
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77426}

test/unittests/BUILD.gn

@@ -500,10 +500,7 @@ v8_source_set("unittests_sources") {
     }
 
     if (is_win) {
-      sources += [
-        "wasm/trap-handler-win-unittest.cc",
-        "avoid-windows-h-includes.cc",
-      ]
+      sources += [ "wasm/trap-handler-win-unittest.cc" ]
     }
 
     # Include this test only on arm64 simulator builds on x64 on Linux, Mac and
@@ -541,5 +538,7 @@ v8_source_set("unittests_sources") {
     # bytecode-utils.h.
     # C4309: 'static_cast': truncation of constant value
     cflags = [ "/wd4309" ]
+
+    sources += [ "avoid-windows-h-includes.cc" ]
   }
 }