rootfs: fs_shel build fix attempt.

Sorry, I can't test all cases when building from Haiku.

Including <new> after the fs shell wrapper makes the compiler fail
because new needs a size_t argument (not an fssh_size_t). But including
it before also fails because it includes C++ typedefs without the fssh
wrapper, leading to conflicts.

Undefining size_t just for the include of <new> isn't very clean, but
seems to work. new gets a size_t argument as it should and the other
typedefs aren't conflicting.

src/system/kernel/fs/rootfs.cpp

@@ -8,10 +8,12 @@
 
 
 #if FS_SHELL
-#	include <new>
-
 #	include "fssh_api_wrapper.h"
 
+#	undef size_t
+#	include <new>
+#	define size_t fssh_size_t
+
 #	include "KOpenHashTable.h"
 #	include "list.h"
 #else