Patch #1006003: Cygwin standard module build problems

Add missing PyAPI_FUNC/PyAPI_DATA macros.
diff --git a/Include/pystrtod.h b/Include/pystrtod.h
index e4e5e52..5314f26 100644
--- a/Include/pystrtod.h
+++ b/Include/pystrtod.h
@@ -6,9 +6,9 @@
 #endif
 
 
-double PyOS_ascii_strtod(const char *str, char **ptr);
-double PyOS_ascii_atof(const char *str);
-char * PyOS_ascii_formatd(char *buffer, int buf_len,  const char *format, double d);
+PyAPI_FUNC(double) PyOS_ascii_strtod(const char *str, char **ptr);
+PyAPI_FUNC(double) PyOS_ascii_atof(const char *str);
+PyAPI_FUNC(char *) PyOS_ascii_formatd(char *buffer, int buf_len,  const char *format, double d);
 
 
 #ifdef __cplusplus