Flashrom update from Stefan, resolve issue 21

Corresponding to flashrom svn r34 and coreboot v2 svn r2111.
diff --git a/sst39sf020.h b/sst39sf020.h
index 698814c..aea62cc 100644
--- a/sst39sf020.h
+++ b/sst39sf020.h
@@ -2,6 +2,6 @@
 #define __SST39SF020_H__ 1
 
 extern int probe_39sf020(struct flashchip *flash);
-extern int write_39sf020(struct flashchip *flash, unsigned char *buf);
+extern int write_39sf020(struct flashchip *flash, uint8_t *buf);
 
 #endif				/* !__SST39SF020_H__ */