Remove ucore_ prefix from headers and source files

src/djbhash.c

@@ -0,0 +1,13 @@
+#include "ucore/hash.h"
+
+uint32_t
+uc_djbhash(const char *str)
+{
+	uint32_t hash = 5381;
+	int c;
+	while ((c = *str++))
+		hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
+
+	return hash;
+}
+