core: don't use declspec(dllexport) when compiling/linking to static library

this is required due to function names being decorated differently by MSVC when building a .dll file

core/include/blue/core/misc.h

@@ -15,11 +15,15 @@
 	(sizeof((arg_type[]) {__VA_ARGS__}) / sizeof(arg_type))
 
 #ifdef _MSC_VER
+#ifdef BLUELIB_STATIC
+#define BLUE_API extern
+#else
 #ifdef BLUELIB_EXPORT
 #define BLUE_API extern __declspec(dllexport)
 #else
 #define BLUE_API extern __declspec(dllimport)
 #endif
+#endif
 #else
 #define BLUE_API extern
 #endif