include missing headers for strcmp(), strdup() and realloc()

src/common/tvgArray.h

@@ -25,6 +25,7 @@
 
 #include <memory.h>
 #include <cstdint>
+#include <cstdlib>
 
 namespace tvg
 {

src/loaders/lottie/tvgLottieBuilder.cpp

@@ -21,6 +21,7 @@
  */
 
 #include <queue>
+#include <cstring>
 
 #include "tvgCommon.h"
 #include "tvgPaint.h"

src/savers/gif/tvgGifSaver.cpp

@@ -21,6 +21,7 @@
  */
 
 #include <stdlib.h>
+#include <cstring>
 #include "gif.h"
 #include "tvgGifSaver.h"