Remove obsolete kludges. All supported versions do not need these hacks.

Furthermore, these hacks break build on head.

PR:		228433

emulators/virtualbox-ose/files/patch-include_iprt_types.h

@@ -0,0 +1,26 @@
+--- include/iprt/types.h.orig	2018-05-09 16:32:07 UTC
++++ include/iprt/types.h
+@@ -56,22 +56,9 @@ RT_C_DECLS_END
+ #  include <sys/types.h>
+ 
+ # elif defined(RT_OS_FREEBSD) && defined(_KERNEL)
+-    /*
+-     * Kludge for the FreeBSD kernel:
+-     *  stddef.h and sys/types.h have slightly different offsetof definitions
+-     *  when compiling in kernel mode. This is just to make GCC shut up.
+-     */
+-#  ifndef _STDDEF_H_
+-#   undef offsetof
+-#  endif
++
+ #  include <sys/stddef.h>
+-#  ifndef _SYS_TYPES_H_
+-#   undef offsetof
+-#  endif
+ #  include <sys/types.h>
+-#  ifndef offsetof
+-#   error "offsetof is not defined!"
+-#  endif
+ 
+ # elif defined(RT_OS_FREEBSD) && HC_ARCH_BITS == 64 && defined(RT_ARCH_X86)
+     /*