fix: Qt host build — pre-create ninja .d dependency directories

CMake ninja generator may not create *.dir output directories
before the first compilation pass, causing 'fatal error: opening
dependency file ... No such file or directory' during the Qt host
tools build (moc, uic, qtwaylandscanner). Add a find+mkdir loop
between cmake configure and cmake --build to pre-create them.

local/recipes/qt/qtbase/recipe.toml

@@ -221,6 +221,12 @@ if [ ! -f "${HOST_BUILD}/libexec/moc" ] || [ ! -f "${HOST_STAMP}" ]; then
         -DFEATURE_wayland=ON \
         -DFEATURE_qtwaylandscanner=ON \
         -Wno-dev
+    # CMake ninja generator may not create .d dependency directories
+    # before the first compilation pass. Pre-create them to avoid
+    # "fatal error: opening dependency file ... No such file or directory".
+    find "${HOST_QTBASE_BUILD}" -name "*.dir" -type d 2>/dev/null | while read dir; do
+        test -d "$dir" || mkdir -p "$dir"
+    done
     (
         cd "${HOST_QTBASE_BUILD}"
         env -i \