[patch] getnameinfo.3: Fix _POSIX_C_SOURCE value for getaddrinfo()

[Sebastian Kirmayer <man-pages@xxxxxxxxxxx>]

The minimum value of _POSIX_C_SOURCE for getnameinfo() was mistyped as 201112L
(not a real POSIX version), it should be 200112L. This is the same typo that
was fixed for getaddrinfo.3 in commit 94db8ae1824ada8561c3dbbbed88a8a9175c4886

According to the current documentation, this file should not compile, but
it does:

    #define _POSIX_C_SOURCE 200112L
    #include <netdb.h>
    int (*mygetnameinfo)() = getnameinfo;

(If _POSIX_C_SOURCE is changed to 200111L, the program does no longer compile.)

man3/getnameinfo.3:

@@ -27,7 +27,7 @@ Feature Test Macro Requirements for glibc (see
 .RE
 .PP
 .BR getnameinfo ():
-    Since glibc 2.22: _POSIX_C_SOURCE >= 201112L
+    Since glibc 2.22: _POSIX_C_SOURCE >= 200112L
     Glibc 2.21 and earlier: _POSIX_C_SOURCE
 .ad b
 .SH DESCRIPTION