config.sh: use prebuilt docgen and pkgar

config.sh

@@ -61,10 +61,10 @@ export STAT
 if [ ! "$(uname -s)" = "Redox" ]
 then
 function docgen {
-    CC=cc AR=ar RANLIB=ranlib cargo run --release --manifest-path "$ROOT/docgen/Cargo.toml" --bin docgen -- "$@"
+    "$ROOT/docgen/target/docgen" "$@"
 }
 
 function pkgar {
-    CC=cc AR=ar RANLIB=ranlib cargo run --release --manifest-path "$ROOT/pkgar/Cargo.toml" --bin pkgar -- "$@"
+    "$ROOT/pkgar/target/release/pkgar" "$@"
 }
-fi
\ No newline at end of file
+fi