Fixed compilation in environments where the native non-local goto isn't available

reactos/include/pseh

diff -u -r1.5 -r1.6
--- framebased.h	3 Jun 2004 22:19:09 -0000	1.5
+++ framebased.h	4 Jun 2004 00:49:40 -0000	1.6
@@ -33,9 +33,10 @@

 #define jmp_buf _SEHJmpBuf_t
 #else
 #include <setjmp.h>

-#include <stddef.h>

 #endif
 

+#include <stddef.h>
+

 typedef struct __SEHFrame
 {
  _SEHPortableFrame_t SEH_Header;