Fix: Move c++ include to c++ section

include/assimp/types.h

@@ -57,12 +57,6 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <string.h>
 #include <sys/types.h>
 
-#ifdef ASSIMP_USE_HUNTER
-#include <utf8.h>
-#else
-#include "../contrib/utf8cpp/source/utf8.h"
-#endif
-
 // Our compile configuration
 #include <assimp/defs.h>
 
@@ -79,6 +73,12 @@ typedef uint32_t ai_uint32;
 
 #ifdef __cplusplus
 
+#ifdef ASSIMP_USE_HUNTER
+#   include <utf8.h>
+#else
+#   include "../contrib/utf8cpp/source/utf8.h"
+#endif
+
 #include <cstring>
 #include <new> // for std::nothrow_t
 #include <string> // for aiString::Set(const std::string&)