Added missing includes (respectively they would be missing soon).

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37254 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/arch/x86/arch_real_time_clock.cpp

@@ -8,6 +8,7 @@
 
 #include <arch/real_time_clock.h>
 #include <arch/cpu.h>
+#include <boot/kernel_args.h>
 
 #include <real_time_clock.h>
 #include <real_time_data.h>

src/system/kernel/debug/debug_builtin_commands.cpp

@@ -10,6 +10,8 @@
 #include "debug_builtin_commands.h"
 
 #include <ctype.h>
+#include <string.h>
+
 #include <debug.h>
 #include <kernel.h>
 

src/system/kernel/device_manager/FileDevice.cpp

@@ -7,6 +7,7 @@
 #include "FileDevice.h"
 
 #include <errno.h>
+#include <string.h>
 #include <unistd.h>
 
 #include <new>