Fix build error on Linux/POSIX

CMakeLists.txt

@@ -180,7 +180,7 @@ elseif(UNIX)
     message(STATUS "Platform: Unix (Linux/BSD/MacOS X)")
 
     # Add platform dependent files
-    list(APPEND BH_SOURCE BH_SOURCE_POSIX)
+    list(APPEND BH_SOURCE ${BH_SOURCE_POSIX})
 
     # Add platform dependent multithreading support
     if(ENABLE_MT)

src/Platform/Posix/Thread.c

@@ -14,7 +14,7 @@ struct BH_ThreadContext
 static void *BH_ThreadRun(void *context)
 {
     BH_ThreadCallback callback;
-    void *data, *result;
+    void *data;
 
     callback = ((struct BH_ThreadContext *)context)->callback;
     data = ((struct BH_ThreadContext *)context)->data;