Fix using gethostbyxxx_r() with newer Android NDK

This might break using it with the older versions, but it's not clear
whether we still need to support them, so for now apply the simplest fix
which works with the recent NDK and we'll add configure tests later if
we really need them.

See https://github.com/wxWidgets/wxWidgets/pull/2195

src/common/sckaddr.cpp

@@ -106,11 +106,17 @@ wxIMPLEMENT_DYNAMIC_CLASS(wxUNIXaddress, wxSockAddress);
     #endif
 #endif // __WINDOWS__
 
-#ifdef __ANDROID__
-    #ifndef HAVE_GETHOSTBYNAME
-    #define HAVE_GETHOSTBYNAME
-    #endif
-#else // these functions are missing on android (see netdb.h)
+// we assume that we have gethostbyaddr_r() if and only if we have
+// gethostbyname_r() and that it uses the similar conventions to it (see
+// comment in configure)
+//
+// this used not to be the case under older Android systems, where
+// gethostbyname_r() was available, but gethostbyaddr_r() wasn't, but it's not
+// clear if we still need to support the old NDKs, so for now keep things
+// simple -- and if we really need to account for this case, we'll add the
+// tests for gethostbyaddr_r() to configure later
+#define HAVE_GETHOSTBYADDR HAVE_GETHOSTBYNAME
+
 #ifdef HAVE_FUNC_GETHOSTBYNAME_R_3
     #define HAVE_FUNC_GETHOSTBYADDR_R_3
 #endif
@@ -120,12 +126,6 @@ wxIMPLEMENT_DYNAMIC_CLASS(wxUNIXaddress, wxSockAddress);
 #ifdef HAVE_FUNC_GETHOSTBYNAME_R_6
     #define HAVE_FUNC_GETHOSTBYADDR_R_6
 #endif
-#endif // __ANDROID__/!__ANDROID__
-
-// we assume that we have gethostbyaddr_r() if and only if we have
-// gethostbyname_r() and that it uses the similar conventions to it (see
-// comment in configure)
-#define HAVE_GETHOSTBYADDR HAVE_GETHOSTBYNAME
 
 // the _r functions need the extra buffer parameter but unfortunately its type
 // differs between different systems and for the systems which use opaque