Use our own lightweight wrapper for thread local storage

With the boost thread helper we have to statically link to the boost libraries, which on most system is built against the latest version of the OS (instead of our current target 10.7). This doesn't seem to be an actual problem, but newer versions of clang issue warnings about it.

Frameworks/crash/src/info.cc

@@ -1,6 +1,6 @@
 #include "info.h"
-#include <boost/thread/tss.hpp>
 #include <oak/debug.h>
+#include <oak/tls_ptr.h>
 
 /* CrashReporter info */
 char const* __crashreporter_info__ = nullptr;
@@ -59,10 +59,7 @@ namespace
 
 	static stack_t& stack ()
 	{
-		static boost::thread_specific_ptr<stack_t> stackPtr;
-		if(!stackPtr.get())
-			stackPtr.reset(new stack_t);
-
+		static oak::tls_ptr_t<stack_t> stackPtr;
 		return *stackPtr;
 	}
 }

Frameworks/crash/target

@@ -1,3 +1,2 @@
 SOURCES       = src/*.cc
 EXPORT        = src/*.h
-LN_FLAGS     += /usr/local/lib/libboost_thread-mt.a /usr/local/lib/libboost_system-mt.a

target

@@ -28,8 +28,6 @@ LN_FLAGS += -rpath @executable_path/../Frameworks
 CXX_FLAGS += -I"$capnp_prefix/include"
 LN_FLAGS  += -L"$capnp_prefix/lib"
 
-LN_FLAGS += /usr/local/lib/libboost_thread-mt.a /usr/local/lib/libboost_system-mt.a
-
 PRELUDE = Shared/PCH/prelude.*
 
 TARGETS  = vendor/*/target