[java-atk-wrapper] Add missing prototype

[Samuel Thibault <sthibaul src gnome org>]

commit 2061b5d45238ebf9a74126218ee0ec13901a76bb
Author: Samuel Thibault <samuel thibault ens-lyon org>
Date:   Tue Jul 9 01:22:05 2019 +0200

    Add missing prototype

 jni/src/AtkWrapper.h | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/jni/src/AtkWrapper.h b/jni/src/AtkWrapper.h
index 68abfc2..10e5b71 100644
--- a/jni/src/AtkWrapper.h
+++ b/jni/src/AtkWrapper.h
@@ -148,6 +148,14 @@ JNIEXPORT void JNICALL Java_org_GNOME_Accessibility_AtkWrapper_boundsChanged
 JNIEXPORT jboolean JNICALL Java_org_GNOME_Accessibility_AtkWrapper_dispatchKeyEvent
   (JNIEnv *, jclass, jobject);
 
+/*
+ * Class:     org_GNOME_Accessibility_AtkWrapper
+ * Method:    getInstance
+ * Signature: (Ljavax/accessibility/AccessibleContext;)J
+ */
+JNIEXPORT jlong JNICALL Java_org_GNOME_Accessibility_AtkWrapper_getInstance
+  (JNIEnv *, jclass, jobject);
+
 #ifdef __cplusplus
 }
 #endif