Add missing ICD function export

Without this, the ICD version is stuck at 1, and the loader refuses to
expose functions such as vkCreateWin32SurfaceKHR.

Bug: b/139184291
Bug: b/125405086
Change-Id: I8f11d1df4c5e3390fca39edaadf310de4842a3d4
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/34913
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
diff --git a/src/Vulkan/libvk_swiftshader.def b/src/Vulkan/libvk_swiftshader.def
index 5605cbb..cfa6d81 100644
--- a/src/Vulkan/libvk_swiftshader.def
+++ b/src/Vulkan/libvk_swiftshader.def
@@ -1,7 +1,8 @@
 LIBRARY vk_swiftshader

 EXPORTS

-	; Mandatory ICD entry function

+	; Loader-ICD interface functions

 	vk_icdGetInstanceProcAddr

+	vk_icdNegotiateLoaderICDInterfaceVersion

 

 	; Optional Vulkan API entry functions

 	vkCreateInstance