Fixes compilation with recent GCC which is more strict about C++.

http://sourceforge.net/tracker/index.php?func=detail&aid=2125955&group_id=122858&atid=694730

--- a/src/readline.cpp

+++ b/src/readline.cpp

@@ -23,6 +23,7 @@

 #endif

 #include <cstdio>

+#include <cstdlib>

 #ifdef WITH_READLINE

 #  include <readline/readline.h>

 #  include <readline/history.h>

--- a/src/libwrapper.cpp

+++ b/src/libwrapper.cpp

@@ -24,6 +24,7 @@

 #include <glib/gi18n.h>

 #include <map>

+#include <cstring>

 #include "utils.hpp"

--- a/src/utils.cpp

+++ b/src/utils.cpp

@@ -22,6 +22,8 @@

 #  include "config.h"

 #endif

+#include <cstdio>

+#include <cstdlib>

 #include <glib.h>

 #include <glib/gi18n.h>

--- a/src/lib/lib.cpp

+++ b/src/lib/lib.cpp

@@ -513,7 +513,7 @@

 {

 	fseek(idxfile, wordoffset[page_idx], SEEK_SET);

 	guint32 page_size=wordoffset[page_idx+1]-wordoffset[page_idx];

-	fread(wordentry_buf, std::min(sizeof(wordentry_buf), page_size), 1, idxfile); //TODO: check returned values, deal with word entry that strlen>255.

+	fread(wordentry_buf, std::min(sizeof(wordentry_buf), (size_t)page_size), 1, idxfile); //TODO: check returned values, deal with word entry that strlen>255.

 	return wordentry_buf;

 }