drg-xmrig 6.25.1-drg2: fix default pool port (3433) and algo

The bundled config had a portless pool URL (pool.dragonx.is), so xmrig
fell back to its default port 3333, which is firewalled on the pool host
-> repeating 'connect error: operation canceled'. The pool's stratum is
plain TCP on 3433 and requires a shielded zs-address worker name.

- src/config.example.json: url -> pool.dragonx.is:3433, algo -> rx/dragonx,
  user placeholder -> YOUR_DRGX_ZS_ADDRESS
- scripts/pool_mine_example.cmd: point at the DragonX pool with rx/dragonx
- scripts/build_windows.sh: fetch OpenSSL 1.1.1w from GitHub release mirror
- bump APP_VERSION to 6.25.1-drg2

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -1,3 +1,10 @@
+# drg-xmrig 6.25.1-drg2
+- Fixed default pool config: `url` now includes the stratum port `pool.dragonx.is:3433` (was portless, falling back to firewalled 3333) and `algo` defaults to `rx/dragonx`.
+- Clarified that the pool requires a shielded `zs-address` as the worker name (config/example placeholders updated).
+- `build_windows.sh`: fetch OpenSSL 1.1.1w from the GitHub release mirror (old openssl.org URL is gone).
+
+---
+
 # XMRig-HAC Fork
 - Added **DragonX** coin support
 - Added **rx/hush** algorithm (RandomX-HUSH variant for HUSH/DragonX)