Update relibc recipe

recipes/relibc/recipe.sh

 GIT=https://github.com/redox-os/relibc.git
 
 function recipe_build {
-    cp -r "$ROOT/Xargo.toml" .
-    xargo build --target "$TARGET" --release
-    xargo rustc --manifest-path src/crt0/Cargo.toml --target "$TARGET" --release -- -v --emit obj="target/$TARGET/release/crt0.o"
+    make
     skip=1
 }
 
@@ -13,7 +11,7 @@ function recipe_stage {
     mkdir -pv "$dest/include"
     cp -rv "include"/* "$dest/include"
     cp -rv "target/include"/* "$dest/include"
-    cp -v "target/$TARGET/release/libc.a" "$dest/lib"
-    cp -v "target/$TARGET/release/crt0.o" "$dest/lib"
+    cp -v "target/$TARGET/debug/libc.a" "$dest/lib"
+    cp -v "target/$TARGET/debug/crt0.o" "$dest/lib"
     skip=1
 }