[newlib-cygwin] Cygwin: netdb.h: fix __GNU_VISIBLE tests

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=6ffcc50f192b75971b88d5e5bdffdeec945153a8

commit 6ffcc50f192b75971b88d5e5bdffdeec945153a8
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Sat Jan 26 18:26:56 2019 +0100

    Cygwin: netdb.h: fix __GNU_VISIBLE tests
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/include/netdb.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/winsup/cygwin/include/netdb.h b/winsup/cygwin/include/netdb.h
index 91e9172..30fb063 100644
--- a/winsup/cygwin/include/netdb.h
+++ b/winsup/cygwin/include/netdb.h
@@ -167,7 +167,7 @@ extern __declspec(dllimport) int h_errno;
 #define AI_ADDRCONFIG   0x400	/* Only return address types available on
 				   this host. */
 #define AI_V4MAPPED     0x800	/* IPv4 mapped addresses are acceptable. */
-#ifdef __GNU_VISIBLE
+#if __GNU_VISIBLE
 /* Glibc extensions. We use numerical values taken by winsock-specific
    extensions. */
 #define AI_IDN          0x4000	/* Encode IDN input from current local to
@@ -186,7 +186,7 @@ extern __declspec(dllimport) int h_errno;
 #define NI_NAMEREQD     0x4	/* Not being able to resolve is an error. */
 #define NI_NUMERICSERV  0x8	/* Return port number, rather than name. */
 #define NI_DGRAM        0x10	/* Lookup datagram (UDP) service. */
-#ifdef __GNU_VISIBLE
+#if __GNU_VISIBLE
 /* Glibc extensions. We use numerical values taken by winsock-specific
    extensions. */
 #define NI_IDN          0x4000	/* Decode name from punycode to IDN in
@@ -215,7 +215,7 @@ extern __declspec(dllimport) int h_errno;
 #define EAI_BADHINTS    12	/* Invalid value for hints */
 #define EAI_PROTOCOL    13	/* Resolved protocol is unknown */
 #define EAI_OVERFLOW    14	/* An argument buffer overflowed */
-#ifdef __GNU_VISIBLE
+#if __GNU_VISIBLE
 /* Glibc extensions. */
 #define EAI_IDN_ENCODE	15	/* Parameter string not correctly encoded */
 #endif