How to include dll libraries in gradle project?

Question

Java

I have a gradle project in java. The project uses the jcpt engine , for its operation it is required to connect several jar-nicknames and native libraries (link) (windiws - .dll, linux - .so). If it’s still clear with .so for linux how to get close (I found this article on Habré, in which it is advised to place all .so files in a jar archive and connect this archive), then how to connect .dll for Windows remains completely incomprehensible (place it in the same way in jar failed). How can I do that?
build.gradle looks like this:

apply plugin: 'java'
apply plugin: "application"

mainClassName = "ru.cfif11.cosmo.Main"

sourceCompatibility = JavaVersion.VERSION_1_7
targetCompatibility = JavaVersion.VERSION_1_7
version = '1.0'

repositories {
    mavenCentral()
}

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.11'
    compile files("jpct/lib/jpct/jpct.jar")
    compile files("jpct/lib/lwjgl-2.8.0/jar/lwjgl.jar")
    compile files("jpct/lib/lwjgl-2.8.0/jar/lwjgl_util.jar")

}

jar {
  manifest.attributes("Main-Class": mainClassName);
}

PS It is even better to automatically detect the system and prescribe paths for linux or windiws automatically