Include DragonFlyBSD in library loading fallback paths

DragonFlyBSD platform support was added in #1593 but the
NativeLibrary fallback paths for versioned .so resolution,
libc special-case loading, and 64-bit library search paths
were not updated to include it.

This causes NoClassDefFoundError when loading libc on
DragonFlyBSD because the matchLibrary() fallback and the
mapSharedLibraryName() handling only trigger for Linux and
FreeBSD.

Author: dbwiddis

CHANGES.md

@@ -23,6 +23,7 @@ Bug Fixes
 * [#1722](https://github.com/java-native-access/jna/pull/1722): Fix `Advapi32#RegisterServiceCtrlHandler` using wrong `Handler` type - [@dbwiddis](https://github.com/dbwiddis).
 * [#1636](https://github.com/java-native-access/jna/issues/1636): Drop hard dependency on java.lang.SecurityManager/java.security.AccessController - [@matthiasblaesing](https://github.com/matthiasblaesing).
 * [#1724](https://github.com/java-native-access/jna/pull/1724): Fix `host_page_size` in `c.s.j.p.mac.SystemB` and `getxattr`/`setxattr`/`listxattr` in `c.s.j.p.mac.XAttr` using `long` instead of pointer-sized types for `size_t`/`ssize_t` parameters - [@dbwiddis](https://github.com/dbwiddis).
+* [#1727](https://github.com/java-native-access/jna/pull/1727): Include DragonFlyBSD in `NativeLibrary` versioned library resolution, libc special-case loading, and 64-bit search paths - [@dbwiddis](https://github.com/dbwiddis).
 
 Release 5.18.1
 ==============

src/com/sun/jna/NativeLibrary.java

@@ -245,7 +245,7 @@ private static NativeLibrary loadLibrary(final String libraryName, final Map<Str
                     exceptions.add(e2);
                 }
             }
-            else if (Platform.isLinux() || Platform.isFreeBSD()) {
+            else if (Platform.isLinux() || Platform.isFreeBSD() || Platform.isDragonFlyBSD()) {
                 //
                 // Failed to load the library normally - try to match libfoo.so.*
                 //
@@ -465,7 +465,7 @@ public static final NativeLibrary getInstance(String libraryName, Map<String, ?>
 
         // Use current process to load libraries we know are already
         // loaded by the VM to ensure we get the correct version
-        if ((Platform.isLinux() || Platform.isFreeBSD() || Platform.isAIX())
+        if ((Platform.isLinux() || Platform.isFreeBSD() || Platform.isDragonFlyBSD() || Platform.isAIX())
             && Platform.C_LIBRARY_NAME.equals(libraryName)) {
             libraryName = null;
         }
@@ -788,7 +788,7 @@ static String mapSharedLibraryName(String libName) {
             }
             return name;
         }
-        else if (Platform.isLinux() || Platform.isFreeBSD()) {
+        else if (Platform.isLinux() || Platform.isFreeBSD() || Platform.isDragonFlyBSD()) {
             if (isVersionedName(libName) || libName.endsWith(".so")) {
                 // A specific version was requested - use as is for search
                 return libName;
@@ -926,8 +926,8 @@ static double parseVersion(String ver) {
             // one when running a 64bit JVM.
             //
             if (Platform.isLinux() || Platform.isSolaris()
-                || Platform.isFreeBSD() || Platform.iskFreeBSD()) {
-                // Linux & FreeBSD use /usr/lib32, solaris uses /usr/lib/32
+                || Platform.isFreeBSD() || Platform.isDragonFlyBSD() || Platform.iskFreeBSD()) {
+                // Linux, FreeBSD & DragonFlyBSD use /usr/lib32, solaris uses /usr/lib/32
                 archPath = (Platform.isSolaris() ? "/" : "") + Native.POINTER_SIZE * 8;
             }
             String[] paths = {