Use system jna - copied into dependencies/flatRepo

Index: Ghidra/Framework/Pty/build.gradle
--- Ghidra/Framework/Pty/build.gradle.orig
+++ Ghidra/Framework/Pty/build.gradle
@@ -25,8 +25,8 @@ apply plugin: 'eclipse'
 eclipse.project.name = 'Framework Pty'
 
 dependencies {
-	api "net.java.dev.jna:jna:5.14.0"
-	api "net.java.dev.jna:jna-platform:5.14.0"
+	api "net.java.dev.jna:jna:${JNA_VER}"
+	api "net.java.dev.jna:jna-platform:${JNA_VER}"
 	api project(":Docking")
 
 	testImplementation project(":Generic")
