Add duktape recipe

recipes/duktape/recipe.sh

+VERSION=2.2.0
+TAR=http://duktape.org/duktape-$VERSION.tar.xz
+
+function recipe_version {
+    echo "$VERSION"
+    skip=1
+}
+
+function recipe_update {
+    echo "skipping update"
+    skip=1
+}
+
+function recipe_build {
+    sed -i "s/= gcc/= $TARGET-gcc/g" Makefile.cmdline
+    make -f Makefile.cmdline
+    skip=1
+}
+
+function recipe_test {
+    echo "skipping test"
+    skip=1
+}
+
+function recipe_clean {
+    make clean
+    skip=1
+}
+
+function recipe_stage {
+    mkdir -pv "$1/bin"
+    cp ./duk "$1/bin/duk"
+
+    skip=1
+}