Recipe for Lua

Ideally, the build system implemented in environ.sh in the libc repo should be properly integrated into the cookbook.

recipes/lua/recipe.sh

+VERSION=5.3.1
+SRC=http://www.lua.org/ftp/lua-$VERSION.tar.gz
+DIR=lua-$VERSION
+
+function recipe_version {
+    echo "$VERSION"
+    return 1
+}
+
+function recipe_update {
+    echo "skipping update"
+    return 1
+}
+
+function recipe_build {
+    make generic CC="$CC -std=gnu99"
+    return 1
+}
+
+function recipe_test {
+    echo "skipping test"
+    return 1
+}
+
+function recipe_clean {
+    make clean
+    return 1
+}
+
+function recipe_stage {
+    mkdir -pv "$1/bin"
+    cp src/lua src/luac "$1/bin"
+    return 1
+}