Minor fixes for compiling the samples with gcc on linux.

Samples/basic/customlog/src/main.cpp

@@ -51,7 +51,7 @@ int main(int ROCKET_UNUSED(argc), char** ROCKET_UNUSED(argv))
 #endif
 {
 	// Generic OS initialisation, creates a window and attaches OpenGL.
-	if (!Shell::Initialise("../samples/basic/customlog/") ||
+	if (!Shell::Initialise("../Samples/basic/customlog/") ||
 		!Shell::OpenWindow("Custom File Handler Sample", true))
 	{
 		Shell::Shutdown();

Samples/basic/treeview/src/FileFormatter.cpp

@@ -26,6 +26,7 @@
  */
 
 #include "FileFormatter.h"
+#include <cstdlib>
 
 FileFormatter::FileFormatter() : Rocket::Controls::DataFormatter("file")
 {

Samples/basic/treeview/src/FileSystem.cpp

@@ -26,7 +26,8 @@
  */
 
 #include "FileSystem.h"
-#include <stdio.h>
+#include <cstdlib>
+#include <cstdio>
 
 #ifdef WIN32
 #include <io.h>