add hidden aliases for ntoh/hton functions

Sometimes references for these functions show up (like when debugging is
enabled), so add hidden aliases for them if needed.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

include/netinet/in.h

@@ -356,12 +356,16 @@ struct group_filter
    may have different representations but the values are always the same.  */
 
 extern uint32_t ntohl (uint32_t __netlong) __THROW __attribute__ ((__const__));
+libc_hidden_proto(ntohl)
 extern uint16_t ntohs (uint16_t __netshort)
      __THROW __attribute__ ((__const__));
+libc_hidden_proto(ntohs)
 extern uint32_t htonl (uint32_t __hostlong)
      __THROW __attribute__ ((__const__));
+libc_hidden_proto(htonl)
 extern uint16_t htons (uint16_t __hostshort)
      __THROW __attribute__ ((__const__));
+libc_hidden_proto(htons)
 
 #include <endian.h>
 

libc/inet/ntohl.c

@@ -9,11 +9,12 @@
 #include <stdint.h>
 #include <endian.h>
 #include <byteswap.h>
+#include <netinet/in.h>
 
-uint32_t ntohl (uint32_t x);
-uint16_t ntohs (uint16_t x);
-uint32_t htonl (uint32_t x);
-uint16_t htons (uint16_t x);
+#undef ntohl
+#undef ntohs
+#undef htonl
+#undef htons
 
 #if __BYTE_ORDER == __BIG_ENDIAN
 uint32_t ntohl (uint32_t x)
@@ -58,3 +59,8 @@ uint16_t htons (uint16_t x)
 #else
 #error "You seem to have an unsupported byteorder"
 #endif
+
+libc_hidden_def(ntohl)
+libc_hidden_def(ntohs)
+libc_hidden_def(htonl)
+libc_hidden_def(htons)