macOS: Fix JIT crash on Apple Silicon

- Add 'com.apple.security.cs.allow-jit' entitlement to 'other/osx/entitlements.xml' to allow W^X memory protection changes.
- Remove redundant 'mprotect' workaround in 'src/jit_aarch64.c' as the entitlement ensures 'pthread_jit_write_protect_np' works correctly.

Author: JamesKim2998

other/osx/entitlements.xml

@@ -2,6 +2,9 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+    <!-- Required for Hot-Reloading on Apple Silicon (W^X memory protection) -->
+    <key>com.apple.security.cs.allow-jit</key>
+    <true/>
     <key>com.apple.security.get-task-allow</key>
     <true/>
 </dict>