Using javac to generate header

jni/jvm/build.gradle.kts

@@ -0,0 +1,25 @@
+plugins {
+    kotlin("jvm")
+}
+
+kotlin {
+    explicitApi()
+}
+
+dependencies {
+    api(project(":jni"))
+    implementation(kotlin("stdlib-jdk8"))
+}
+
+val copyJni by tasks.creating(Sync::class) {
+    dependsOn(":native:buildSecp256k1Jvm")
+    from(rootDir.resolve("native/build/linux/libsecp256k1-jni.so")) { rename { "libsecp256k1-jni-linux-x86_64.so" } }
+    from(rootDir.resolve("native/build/darwin/libsecp256k1-jni.dylib")) { rename { "libsecp256k1-jni-darwin-x86_64.dylib" } }
+    from(rootDir.resolve("native/build/mingw/secp256k1-jni.dll")) { rename { "secp256k1-jni-mingw-x86_64.dll" } }
+    into(buildDir.resolve("jniResources/fr/acinq/secp256k1/jni/native"))
+}
+
+(tasks["processResources"] as ProcessResources).apply {
+    dependsOn("copyJni")
+    from(buildDir.resolve("jniResources"))
+}