Android debug mode works, but release don't. Crashes at launch

Testing again with r10c:

W/dalvikvm(16609): threadid=1: thread exiting with uncaught exception (group=0x41690d40)

E/AndroidRuntime(16609): FATAL EXCEPTION: main

E/AndroidRuntime(16609): Process: com.home.gameapp, PID: 16609

E/AndroidRuntime(16609): java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "srand" referenced by "libcocos2dcpp.so"...

E/AndroidRuntime(16609):     at java.lang.Runtime.loadLibrary(Runtime.java:364)

E/AndroidRuntime(16609):     at java.lang.System.loadLibrary(System.java:526)

r9d works because builds with android-19
r10c builds directly with android-21 = Android 5.0+ only i think ,and my device is running with 4.4.4.

Solution with r10c: jni/Application.mk

APP_PLATFORM=android-19

Not sure (can’t test) if android-19 will work on older (like Android 2.3) versions