fssh_api_wrapper: fix build on non-Haiku.

* I'm not sure why strings.h needs to be included before <new>, but it
wouldn't work otherwise.

headers/private/fs_shell/fssh_api_wrapper.h

@@ -6,6 +6,10 @@
 #define _FSSH_API_WRAPPER_H
 
 
+#include <string.h>
+#ifdef __cplusplus
+#include <new>
+#endif
 #include <stdlib.h>
 
 #include "fssh_dirent.h"

src/system/kernel/fs/rootfs.cpp

@@ -10,10 +10,6 @@
 #if FS_SHELL
 #	include "fssh_api_wrapper.h"
 
-#	undef size_t
-#	include <new>
-#	define size_t fssh_size_t
-
 #	include "KOpenHashTable.h"
 #	include "list.h"
 #else