Clang and dynamic_pointer_cast

[brettviren]

At the core of WCT is the NamedFactory which provides object construction and lookup based on a component "type" (not C++ type) and an "instance" name. For this to work a dynamic_pointer_cast of the shared pointers must work.

Apparently there's some dark art related to this. It's worked for years for many versions of GCC but now Clang is being tested at 5.0.1 causes the test_dlopen test to fail.

A search finds this issue: android/ndk#533 and indeed moving inline desctructors out of the header and into an implementation file lets this test pass.