the sha1 functions are part of the SDK so remove sha1.c

Author: Links2004

hardware/esp8266com/esp8266/libraries/Hash/src/hash.cpp renamed to hardware/esp8266com/esp8266/libraries/Hash/src/Hash.cpp

@@ -1,5 +1,5 @@
 /**
- * @file hash.cpp
+ * @file Hash.cpp
  * @date 20.05.2015
  * @author Markus Sattler
  *
@@ -24,7 +24,7 @@
 
 #include <Arduino.h>
 
-#include "hash.h"
+#include "Hash.h"
 
 extern "C" {
     #include "sha1/sha1.h"

hardware/esp8266com/esp8266/libraries/Hash/src/hash.h renamed to hardware/esp8266com/esp8266/libraries/Hash/src/Hash.h

@@ -1,5 +1,5 @@
 /**
- * @file hash.h
+ * @file Hash.h
  * @date 20.05.2015
  * @author Markus Sattler
  *