fixed MSVC warnings and iOS framework compile error

modules/features2d/src/akaze.cpp

@@ -86,7 +86,7 @@ namespace cv
         void setDescriptorChannels(int dch) { descriptor_channels = dch; }
         int getDescriptorChannels() const { return descriptor_channels; }
 
-        void setThreshold(double threshold_) { threshold = threshold_; }
+        void setThreshold(double threshold_) { threshold = (float)threshold_; }
         double getThreshold() const { return threshold; }
 
         void setNOctaves(int octaves_) { octaves = octaves_; }

modules/features2d/src/kaze.cpp

@@ -75,7 +75,7 @@ namespace cv
         void setUpright(bool upright_) { upright = upright_; }
         bool getUpright() const { return upright; }
 
-        void setThreshold(double threshold_) { threshold = threshold_; }
+        void setThreshold(double threshold_) { threshold = (float)threshold_; }
         double getThreshold() const { return threshold; }
 
         void setNOctaves(int octaves_) { octaves = octaves_; }

modules/world/src/world_init.cpp

@@ -44,9 +44,5 @@
 
 bool cv::initAll()
 {
-    return true
-#ifdef HAVE_OPENCV_VIDEO
-    && initModule_video()
-#endif
-    ;
+    return true;
 }