Fix makefile and includes.

libguac/Makefile.am

@@ -44,7 +44,7 @@ libguacinc_HEADERS = include/client.h include/socket.h include/protocol.h includ
 
 lib_LTLIBRARIES = libguac.la
 
-libguac_la_SOURCES = src/client.c src/socket.c src/protocol.c src/client-handlers.c src/error.c src/palette.c
+libguac_la_SOURCES = src/client.c src/socket.c src/protocol.c src/client-handlers.c src/error.c src/palette.c src/unicode.c
 
 libguac_la_LDFLAGS = -version-info 3:1:0
 

libguac/include/unicode.h

@@ -38,6 +38,8 @@
 #ifndef _GUAC_UNICODE_H
 #define _GUAC_UNICODE_H
 
+#include <stddef.h>
+
 /**
  * Given the initial byte of a single UTF-8 character, returns the overall
  * byte size of the entire character.

libguac/src/unicode.c

@@ -35,6 +35,8 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
+#include <stddef.h>
+
 #include "unicode.h"
 
 size_t guac_utf8_charsize(unsigned char c) {