Remove __LIBC_HIDDEN__

Now that we're hiding all symbols, there's no point in hand-picking
which ones to hide.

Test: atest netd_integration_test
Change-Id: Id88f10cb4c8e25635b6f4c94118a6b3a27b14cb5
diff --git a/resolv/resolv_netid.h b/resolv/resolv_netid.h
index c92c374..213c3d9 100644
--- a/resolv/resolv_netid.h
+++ b/resolv/resolv_netid.h
@@ -34,7 +34,7 @@
  */
 #include <netinet/in.h>
 #include <stdio.h>
-#include <sys/cdefs.h>
+
 #include "resolv_params.h"
 
 /*
@@ -111,10 +111,10 @@
 
 /* Internal use only. */
 struct hostent* android_gethostbyaddrfornetcontext_proxy(
-        const void*, socklen_t, int, const struct android_net_context*) __LIBC_HIDDEN__;
+        const void*, socklen_t, int, const struct android_net_context*);
 int android_getnameinfofornet(const struct sockaddr*, socklen_t, char*, size_t, char*, size_t, int,
-                              unsigned, unsigned) __LIBC_HIDDEN__;
-FILE* android_open_proxy(void) __LIBC_HIDDEN__;
+                              unsigned, unsigned);
+FILE* android_open_proxy(void);
 
 __END_DECLS