fix: libwayland SFD_CLOEXEC + glib meson, suppress cascade packages

libwayland: check signal.h SIG_BLOCK instead of sys/signalfd.h SFD_CLOEXEC
glib: add -I sysroot/include to meson c_args
redox-drm: remove amdgpu build dep (not needed for boot)
config: suppress curl, git, mc, libinput, KF6 chain (cascade rebuild)

Build succeeds: 4 GiB harddrive.img, boots with compositor.
Greeter blocked on libwayland relibc header gaps (prctl.h etc).

local/recipes/gpu/redox-drm/recipe.toml

@@ -5,12 +5,10 @@ patches = ["P1-intel-gen-gate.patch", "P2-intel-display-fixes.patch", "P3-intel-
 [build]
 template = "cargo"
 dependencies = [
-    "amdgpu",
     "redox-driver-sys",
     "linux-kpi",
 ]
 
 [package]
 dependencies = [
-    "amdgpu",
 ]