Only add the JNI headers from OpenJDK 21 Windows version. We don't build the JDK for Windows nor we support development from Windows but the JNI headers are useful for Kotlin multi-platform cross-compilation.
The file where extracted from https://download.java.net/java/GA/jdk21.0.2/f2283984656d49d69e91c558476027ac/13/GPL/openjdk-21.0.2_windows-x64_bin.zip
Bug: 335531615
Test: Verified windows-x86 is not removed after running update.sh
Change-Id: Ia60158b8fa37f645386a33ef8cf1df38cd8eafe8
Daniel Santiago Rivera