fix: add YAML_CPP_API for windows-shared library builds

Author: SGSSGene

include/yaml-cpp/fptostring.h

@@ -8,9 +8,9 @@
 
 namespace YAML {
 // "precision = 0" refers to shortest known unique representation of the value
-std::string FpToString(float v, size_t precision = 0);
-std::string FpToString(double v, size_t precision = 0);
-std::string FpToString(long double v, size_t precision = 0);
+YAML_CPP_API std::string FpToString(float v, size_t precision = 0);
+YAML_CPP_API std::string FpToString(double v, size_t precision = 0);
+YAML_CPP_API std::string FpToString(long double v, size_t precision = 0);
 }
 
 #endif