add libflate

src/libflate/flateerr.c

@@ -0,0 +1,23 @@
+#include <u.h>
+#include <libc.h>
+#include <flate.h>
+
+char *
+flateerr(int err)
+{
+	switch(err){
+	case FlateOk:
+		return "no error";
+	case FlateNoMem:
+		return "out of memory";
+	case FlateInputFail:
+		return "input error";
+	case FlateOutputFail:
+		return "output error";
+	case FlateCorrupted:
+		return "corrupted data";
+	case FlateInternal:
+		return "internal error";
+	}
+	return "unknown error";
+}