rust-cg-gcc: fix config to not download dep

Signed-off-by: Marc Poulhiès <dkm@kataplop.net>

Author: dkm

rust-cg-gcc/build.sh

@@ -124,8 +124,6 @@ pushd rustc_codegen_gcc
 echo "gcc-path = \"$libgccjit_path\"" > config.toml
 echo "download-gccjit = false" >> config.toml
 
-cp config.example.toml config.toml
-
 ./y.sh prepare
 ./y.sh build --sysroot --release