macOS: allow unsigned executable memory

With hardened runtime app crashes in sws_scale when converting pixel
formats. Unsigned executable memory entitlement fix the crash.

Change-Id: Ia6e8cd0b1ff9537343991f730d0ed63384d17c2d

resources/entitlements/Jami.entitlements

@@ -10,5 +10,7 @@
 	<true/>
 	<key>com.apple.security.cs.allow-jit</key>
 	<true/>
+	<key>com.apple.security.cs.allow-unsigned-executable-memory</key>
+	<true/>
 </dict>
 </plist>