Set O3 compile flag

Author: awxkee

avif-coder/src/main/cpp/CMakeLists.txt

@@ -44,6 +44,8 @@ if(ANDROID_ABI STREQUAL arm64-v8a)
     add_definitions("-DHAVE_NEON=1")
 endif()
 
+set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3")
+
 target_include_directories(coder PRIVATE ${CMAKE_SOURCE_DIR}/libheif ${CMAKE_SOURCE_DIR} ${CMAKE_SOURCE_DIR}/libyuv)
 # Searches for a specified prebuilt library and stores the path as a
 # variable. Because CMake includes system libraries in the search path by