Add proguard generation logic to the dynamic links library

Missed dynamic links when adding it to the various libraries.

PiperOrigin-RevId: 281862716

Author: a-maurice

dynamic_links/CMakeLists.txt

@@ -71,7 +71,9 @@ else()
   add_definitions(-include assert.h -include string.h)
 endif()
 
-if(IOS)
+if(ANDROID)
+  firebase_cpp_proguard_file(dynamic_links)
+elseif(IOS)
   # Enable Automatic Reference Counting (ARC).
   set_property(
     TARGET firebase_dynamic_links