qtbase: drop __redox__ struct ifreq fallback; bump relibc pointer

relibc now provides a complete struct ifreq (+ ifr_* accessor macros and
SIOCGIF* ioctls) in <net/if.h>, so qnetworkinterface_unix.cpp's __redox__
fallback definition became a redefinition of the system type. Remove it; the
network module now uses the real relibc struct ifreq.

local/recipes/qt/qtbase/source/src/network/kernel/qnetworkinterface_unix.cpp

@@ -31,35 +31,10 @@
 
 #include <qplatformdefs.h>
 
-#if defined(__redox__)
-// Redox relibc's <net/if.h> declares the interface flags and if_nameindex()
-// helpers but not struct ifreq (there is no SIOCGIF* ioctl support on Redox).
-// The getifaddrs path below still declares a `struct ifreq` to pass to
-// getMtu(); the SIOCGIFMTU body is #ifdef-guarded and compiles out, so this
-// only needs to be a complete type. Provide a minimal-but-standard layout so
-// the network module builds; the ioctls that would use it fail gracefully at
-// runtime (mtu stays 0).
-#  ifndef IFNAMSIZ
-#    define IFNAMSIZ 16
-#  endif
-struct ifreq {
-    char ifr_name[IFNAMSIZ];
-    union {
-        struct sockaddr ifr_addr;
-        struct sockaddr ifr_dstaddr;
-        struct sockaddr ifr_broadaddr;
-        struct sockaddr ifr_netmask;
-        struct sockaddr ifr_hwaddr;
-        short          ifr_flags;
-        int            ifr_ifindex;
-        int            ifr_metric;
-        int            ifr_mtu;
-        char           ifr_slave[IFNAMSIZ];
-        char           ifr_newname[IFNAMSIZ];
-        char          *ifr_data;
-    };
-};
-#endif // __redox__
+// Redox's relibc now provides a complete struct ifreq (with the ifr_* union
+// accessor macros and the SIOCGIF* ioctls) in <net/if.h>, so the previous
+// __redox__ fallback definition here is no longer needed and would be a
+// redefinition of the system type.
 
 QT_BEGIN_NAMESPACE