Fix export_targets Windows presubmit with Vulkan Loader.

Bug: angleproject:6912
Change-Id: I96809a46ca5898ad091c6651c07594609f342f98
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3399044
Reviewed-by: Jamie Madill <jmadill@google.com>
Commit-Queue: Jamie Madill <jmadill@google.com>
diff --git a/scripts/export_targets.py b/scripts/export_targets.py
index d4c19b5..6117a26 100755
--- a/scripts/export_targets.py
+++ b/scripts/export_targets.py
@@ -211,6 +211,7 @@
     b'libANGLE/renderer/vulkan/win32/DisplayVkWin32.h',
     b'libANGLE/renderer/vulkan/xcb/DisplayVkXcb.h',
     b'loader_cmake_config.h',
+    b'loader_linux.h',
     b'loader_windows.h',
     b'optick.h',
     b'spirv-tools/libspirv.h',