fixed dependencies

vendor/gocv.io/x/gocv/features2d_string.go

@@ -0,0 +1,33 @@
+package gocv
+
+/*
+#include <stdlib.h>
+#include "features2d.h"
+*/
+import "C"
+
+func (c FastFeatureDetectorType) String() string {
+	switch c {
+	case FastFeatureDetectorType58:
+		return "fast-feature-detector-type-58"
+	case FastFeatureDetectorType712:
+		return "fast-feature-detector-type-712"
+	case FastFeatureDetectorType916:
+		return "fast-feature-detector-type-916"
+	}
+	return ""
+}
+
+func (c DrawMatchesFlag) String() string {
+	switch c {
+	case DrawDefault:
+		return "draw-default"
+	case DrawOverOutImg:
+		return "draw-over-out-imt"
+	case NotDrawSinglePoints:
+		return "draw-single-points"
+	case DrawRichKeyPoints:
+		return "draw-rich-key-points"
+	}
+	return ""
+}