Include C++ standard headers

When compiling in C++ mode, the C++ standard library headers should be
included instead of their C counterparts.

Drive-by:
- Removed include of `json/json.h` from `settings.cpp`, where it was not
  used

1 files changed, 1 insertions, 1 deletions

diff --git a/http.cpp b/http.cpp
index 08bdc275..f1b5d100 100644
--- a/http.cpp
+++ b/http.cpp
@@ -18,7 +18,7 @@
 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 // IN THE SOFTWARE.
 
-#include <string.h>
+#include <cstring>
 #include <chrono>
 #include <thread>
 #include <math.h>