sha1: removed xmpp_ prefix from SHA1 symbols

Prefix was introduced in a981c0a as a workaround. Now, non-public API is
not exported, so this patch hides SHA1 symbols for dynamic library.

src/sha1.h

@@ -20,11 +20,6 @@ typedef struct {
 
 #define SHA1_DIGEST_SIZE 20
 
-/* prevent name collisions with libcrypto */
-#define SHA1_Init   xmpp_SHA1_Init
-#define SHA1_Update xmpp_SHA1_Update
-#define SHA1_Final  xmpp_SHA1_Final
-
 void SHA1_Init(SHA1_CTX* context);
 void SHA1_Update(SHA1_CTX* context, const uint8_t* data, const size_t len);
 void SHA1_Final(SHA1_CTX* context, uint8_t digest[SHA1_DIGEST_SIZE]);