Fix compile errors for Arduino

.gitignore

@@ -17,6 +17,7 @@ unishox
 unishox1
 !unishox1/
 usx3
+u3b
 tex/.*
 unishox2
 unishox++_0_1_0

Arduino/Arduino.ino

@@ -0,0 +1,22 @@
+// Example sketch to demonstrate use of buffer size limiting for compression and decompression
+#include "unishox2.h"
+#include <Arduino.h>
+
+void setup() {
+  Serial.begin(115200);
+  char cbuf[8]; // Restrict buffer size to check that it does not overflow
+  char dbuf[8];
+  int clen, dlen;
+  clen = unishox2_compress_lines("Hello World", 11, cbuf, sizeof(cbuf) - 1, USX_PSET_DFLT, NULL);
+  clen = 8; // clen would have been -1 since buffer was not sufficient
+  dlen = unishox2_decompress_lines(cbuf, clen, dbuf, sizeof(dbuf) - 1, USX_PSET_DFLT, NULL);
+  dlen = 7;
+  dbuf[dlen] = '\0';
+  Serial.print("Decompressed output: ");
+  Serial.println(dbuf);
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+}