Remove the sha1.h header file and inline the content into hash.c

Given that the sha1.h header file should never be included into
any other file, since it represents an implementation detail of
hash.c, we remove the header and inline it's content.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

src/hash.c

@@ -25,7 +25,14 @@
 
 #include "common.h"
 #include "hash.h"
-#include "sha1.h"
+
+#if defined(PPC_SHA1)
+# include "ppc/sha1.h"
+#elif defined(OPENSSL_SHA1)
+# include <openssl/sha.h>
+#else
+# include "block-sha1/sha1.h"
+#endif
 
 struct git_hash_ctx {
 	SHA_CTX c;

src/sha1.h

-#ifndef INCLUDE_sha1_h__
-#define INCLUDE_sha1_h__
-
-#if defined(PPC_SHA1)
-# include "ppc/sha1.h"
-#elif defined(OPENSSL_SHA1)
-# include <openssl/sha.h>
-#else
-# include "block-sha1/sha1.h"
-#endif
-
-#endif /* INCLUDE_sha1_h__ */