bring md5 and sha1 names closer. no code changes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/include/libbb.h b/include/libbb.h
index d05b2d4..dec4e3a 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1539,8 +1539,8 @@
 	uint32_t B;
 	uint32_t C;
 	uint32_t D;
-	uint64_t total;
-	char buffer[64];
+	uint64_t total64;
+	char wbuffer[64];
 } md5_ctx_t;
 #else
 /* libbb/md5prime.c uses a bit different one: */