resolve some header namespace non-issues

after re-reading 2.2.2 of POSIX 2008, all of these are in the correct
reserved namespaces and do not need protection.

arch/i386/bits/socket.h

@@ -201,7 +201,6 @@ struct linger
         ((struct cmsghdr *)__CMSG_NEXT(cmsg))))
 #define CMSG_FIRSTHDR(mhdr) ((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr) ? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) 0)
 
-/* Are these valid? */
 #define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) & (size_t) ~(sizeof (size_t) - 1))
 #define CMSG_SPACE(len) (CMSG_ALIGN (len) + CMSG_ALIGN (sizeof (struct cmsghdr)))
 #define CMSG_LEN(len)   (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))

include/netinet/in.h

@@ -134,7 +134,6 @@ uint16_t ntohs(uint16_t);
 
 #include <bits/in.h>
 
-#if 1 /* FIXME: namespace violation */
 #define	IN_CLASSA(a)		((((in_addr_t)(a)) & 0x80000000) == 0)
 #define	IN_CLASSA_NET		0xff000000
 #define	IN_CLASSA_NSHIFT	24
@@ -153,6 +152,5 @@ uint16_t ntohs(uint16_t);
 #define	IN_MULTICAST(a)		IN_CLASSD(a)
 #define	IN_EXPERIMENTAL(a)	((((in_addr_t)(a)) & 0xe0000000) == 0xe0000000)
 #define	IN_BADCLASS(a)		((((in_addr_t)(a)) & 0xf0000000) == 0xf0000000)
-#endif
 
 #endif