Static Qt for Android mustn't implement JNI_OnLoad

qsslsocket_openssl_android.cpp contains a definition on JNI_OnLoad function. When Qt is build as a static library and is linked to a binary that already contains a definition of JNI_OnLoad, the linker returns "multiple definitions" error.

If Qt does really need to define this function, then it should provide a way for a client code to handle JNI_OnLoad somehow.