fix win32 porting.

specify missing dll import/export declarations for EAPIs.

src/lib/enventor_private.h

@@ -1,6 +1,25 @@
 #ifndef __ENVENTOR_PRIVATE_H__
 #define __ENVENTOR_PRIVATE_H__
 
+/***
+ * Compatible ABI for Win32
+ ***/
+#ifdef _WIN32
+# ifdef EAPI
+#  undef EAPI
+# endif
+# ifdef ENVENTOR_WIN32_BUILD_SUPPORT
+#  define EAPI __declspec(dllexport)
+# else
+#  define EAPI __declspec(dllimport)
+# endif
+# ifdef EOAPI
+#  undef EOAPI
+# endif
+#define EOAPI EAPI
+#endif
+
+
 #include "common.h"
 
 #define QUOT """