sddm: stub VirtualTerminal for Redox (no Linux VT subsystem)

VirtualTerminal.cpp uses the Linux/FreeBSD VT ioctls (VT_ACTIVATE, VT_WAITACTIVE,
VT_SETMODE, KDSETMODE, ...) which Redox does not have -> "VT_ACTIVATE was not
declared". Redox has no VT switching; the greeter runs directly on the
compositor/framebuffer. Add a #if defined(__redox__) branch providing no-op
stubs for the public API (path/currentVt/setUpNewVt/jumpToVt) and skip the
linux/vt.h + linux/kd.h includes. Durable patch.

local/recipes/kde/sddm/recipe.toml

@@ -9,7 +9,11 @@ version = "0.1.0"
 [source]
 git = "https://github.com/sddm/sddm.git"
 rev = "63780fcd79f1dbf81a30eef48c28c699ab15aded"
-patches = []
+patches = [
+    # Redox has no Linux/FreeBSD VT subsystem (VT_ACTIVATE/VT_WAITACTIVE/KDSETMODE
+    # etc.); stub SDDM::VirtualTerminal to no-ops (greeter runs on the compositor).
+    "redox-virtualterminal-stub.patch",
+]
 
 [build]
 template = "custom"

local/recipes/kde/sddm/redox-virtualterminal-stub.patch

@@ -0,0 +1,33 @@
+--- a/src/common/VirtualTerminal.cpp
++++ b/src/common/VirtualTerminal.cpp
+@@ -29,7 +29,7 @@
+ #include <signal.h>
+ #ifdef __FreeBSD__
+ #include <sys/consio.h>
+-#else
++#elif !defined(__redox__)
+ #include <linux/vt.h>
+ #include <linux/kd.h>
+ #endif
+@@ -42,6 +42,14 @@
+ 
+ namespace SDDM {
+     namespace VirtualTerminal {
++#if defined(__redox__)
++        // Redox has no Linux/FreeBSD VT subsystem; the greeter runs directly on
++        // the compositor/framebuffer, so VT enumeration/switching is a no-op.
++        QString path(int vt) { return QStringLiteral("/dev/tty%1").arg(vt); }
++        int currentVt() { return 1; }
++        int setUpNewVt() { return 1; }
++        void jumpToVt(int, bool) { }
++#else
+ #ifdef __FreeBSD__
+         static const char *defaultVtPath = "/dev/ttyv0";
+ 
+@@ -254,5 +262,6 @@
+             if (vtFd != -1)
+                 close(vtFd);
+         }
++#endif // !__redox__
+     }
+ }