Recursive_mutex lock error on exiting

@tekt wrote:

Building and running the examples/3d/ofBoxExample app on OSX 10.11.5 with XCode 7.3.1 triggers the following error when the app exits:

libc++abi.dylib: terminating with uncaught exception of type std::_1::systemerror: recursive_mutex lock failed: Invalid argument

Info:
OSX 10.11.5
XCode 7.3.1
oF 0.9.3 head/master from github at commit f4276f0 (https://github.com/openframeworks/openFrameworks/commit/f4276f05533b828454f88e40b3bc48bfe7eae9ca)

It appears to be happening in the ofEasyCam destructor.

Stack trace:
* thread #1: tid = 0x588077, 0x00007fff8c7f7f06 libsystem_kernel.dylib__pthread_kill + 10, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
* frame #0: 0x00007fff8c7f7f06 libsystem_kernel.dylib_pthreadkill + 10
frame #1: 0x0000000100ddd42d libsystem_pthread.dylibpthread_kill + 90
frame #2: 0x00007fff8eab46e7 libsystem_c.dylibabort + 129
frame #3: 0x00007fff8a8d5f81 libc++abi.dylibabort_message + 257
frame #4: 0x00007fff8a8fba2f libc++abi.dylibdefault_terminate_handler() + 243
frame #5: 0x00007fff8dc0d6c3 libobjc.A.dylib_objc_terminate() + 124
frame #6: 0x00007fff8a8f919e libc++abi.dylibstd::__terminate(void (*)()) + 8
frame #7: 0x00007fff8a8f9213 libc++abi.dylibstd::terminate() + 51
frame #8: 0x00000001000030ff ofBoxExampleDebug_clangcall_terminate + 15
frame #9: 0x00000001003e574e ofBoxExampleDebugofEasyCam::~ofEasyCam(this=<unavailable>) + 104 at ofEasyCam.cpp:45
frame #10: 0x0000000100003cc1 ofBoxExampleDebugofApp::~ofApp(this=0x0000000101074e00) + 65 at ofApp.h:5
frame #11: 0x0000000100003bc5 ofBoxExampleDebugofApp::~ofApp(this=0x0000000101074e00) + 21 at ofApp.h:5
frame #12: 0x0000000100003be9 ofBoxExampleDebugofApp::~ofApp(this=0x0000000101074e00) + 25 at ofApp.h:5
frame #13: 0x00007fff8f74bcb8 libc++.1.dylibstd::__1::__shared_weak_count::__release_shared() + 44
frame #14: 0x00000001003e0ea6 ofBoxExampleDebugofRunApp(std::1::shared_ptr) [inlined] std::1::shared_ptr::~shared_ptr() + 109 at memory:4567
frame #15: 0x00000001003e0e9c ofBoxExampleDebugofRunApp(std::__1::shared_ptr<ofBaseApp>) [inlined] std::__1::shared_ptr<ofBaseApp>::~shared_ptr() at memory:4565
frame #16: 0x00000001003e0e9c ofBoxExampleDebugofRunApp(std::1::shared_ptr) [inlined] std::1::shared_ptr::reset() + 10 at memory:4696
frame #17: 0x00000001003e0e92 ofBoxExampleDebugofRunApp(app=<unavailable>) + 89 at ofAppRunner.cpp:171
frame #18: 0x00000001003e0e07 ofBoxExampleDebugofRunApp(OFSA=) + 37 at ofAppRunner.cpp:164
frame #19: 0x0000000100001a84 ofBoxExampleDebugmain + 100 at main.cpp:12
frame #20: 0x0000000100001a14 ofBoxExampleDebugstart + 52

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