api: fixed a build linking issue on lottie

- something wrong with typeinfo missing in destructor
(don't know reason) and this resolves the problem.

- added override specifier for destructors

inc/thorvg.h

@@ -1701,7 +1701,7 @@ public:
 class TVG_API SwCanvas final : public Canvas
 {
 public:
-    ~SwCanvas();
+    ~SwCanvas() override;
 
     /**
      * @brief Sets the drawing target for the rasterization.
@@ -1745,7 +1745,7 @@ public:
 class TVG_API GlCanvas final : public Canvas
 {
 public:
-    ~GlCanvas();
+    ~GlCanvas() override;
 
     /**
      * @brief Sets the drawing target for rasterization.
@@ -1794,7 +1794,7 @@ public:
 class TVG_API WgCanvas final : public Canvas
 {
 public:
-    ~WgCanvas();
+    ~WgCanvas() override;
 
     /**
      * @brief Sets the drawing target for the rasterization.

src/loaders/lottie/thorvg_lottie.h

@@ -20,6 +20,8 @@ namespace tvg
 class TVG_API LottieAnimation final : public Animation
 {
 public:
+    ~LottieAnimation() override;
+
     /**
      * @brief Override Lottie properties using slot data.
      *

src/loaders/lottie/tvgLottieAnimation.cpp

@@ -26,9 +26,8 @@
 #include "tvgAnimation.h"
 
 
-LottieAnimation::LottieAnimation()
-{
-}
+LottieAnimation::LottieAnimation() = default;
+LottieAnimation::~LottieAnimation() = default;
 
 
 Result LottieAnimation::override(const char* slot) noexcept