[JENKINS-57515] update JNA library from 4.5.2 to 5.3.1 (#4060)

* [JENKINS-57515] update jna library to 5.3.1

This solves problems with loading native libraries of jna on AIX
platform when using openJDK or other JDKs that assume .so is the
extension for shared libraries

* Pointer.SIZE -> Native.POINTER_SIZE

* remove unnecessary import

* adjust to changed api

core/pom.xml

@@ -534,7 +534,7 @@ THE SOFTWARE.
     <dependency>
       <groupId>net.java.dev.jna</groupId>
       <artifactId>jna</artifactId>
-      <version>4.5.2</version>
+      <version>5.3.1</version>
     </dependency>
     <dependency>
       <groupId>org.kohsuke</groupId>

core/src/main/java/hudson/util/ProcessTree.java

@@ -26,7 +26,6 @@ package hudson.util;
 import com.sun.jna.Memory;
 import com.sun.jna.Native;
 import com.sun.jna.NativeLong;
-import com.sun.jna.Pointer;
 import com.sun.jna.LastErrorException;
 import com.sun.jna.ptr.IntByReference;
 import hudson.EnvVars;
@@ -1442,7 +1441,7 @@ public abstract class ProcessTree implements Iterable<OSProcess>, IProcessTree,
                      * Read the remainder of psinfo_t differently depending on whether the
                      * Java process is 32-bit or 64-bit.
                      */
-                    if (Pointer.SIZE == 8) {
+                    if (Native.POINTER_SIZE == 8) {
                         psinfo.seek(236);  // offset of pr_argc
                         argc = adjust(psinfo.readInt());
                         argp = adjustL(psinfo.readLong());

core/src/main/java/hudson/util/jna/Kernel32Utils.java

@@ -115,7 +115,7 @@ public class Kernel32Utils {
     public static File getTempDir() {
         Memory buf = new Memory(1024);
         if (Kernel32.INSTANCE.GetTempPathW(512,buf)!=0) {// the first arg is number of wchar
-            return new File(buf.getString(0, true));
+            return new File(buf.getWideString(0));
         } else {
             return null;
         }