qtbase: durable patch for struct ifreq on Redox (6.11.1)

qnetworkinterface_unix.cpp getifaddrs path declares `struct ifreq ifr` to pass
to getMtu(), but Redox relibc <net/if.h> provides only interface flags and the
if_nameindex() helpers -- no struct ifreq (Redox has no SIOCGIF* ioctls). The
SIOCGIFMTU body in getMtu() is #ifdef-guarded and compiles out, so the type
only needs to be complete. Define a minimal-but-standard struct ifreq under
#if defined(__redox__) at file scope; the ioctls that would use it fail
gracefully at runtime (mtu stays 0). Durable patch, wired into qtbase recipe.

local/recipes/qt/qtbase/recipe.toml

@@ -14,6 +14,7 @@ patches = [
     "qtwaylandscanner-null-guard-listeners.patch",
     "redox-in6-pktinfo.patch",
     "redox-forkfd-rusage-scope.patch",
+    "redox-ifreq-struct.patch",
 ]
 
 [build]

local/recipes/qt/qtbase/redox-ifreq-struct.patch

@@ -0,0 +1,39 @@
+--- a/src/network/kernel/qnetworkinterface_unix.cpp
++++ b/src/network/kernel/qnetworkinterface_unix.cpp
+@@ -31,6 +31,36 @@
+ 
+ #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__
++
+ QT_BEGIN_NAMESPACE
+ 
+ static QHostAddress addressFromSockaddr(sockaddr *sa, int ifindex = 0, const QString &ifname = QString())