[ci] Set executable bit on csmith binary.
The asan CI job started failing with a permission error on the Csmith
binary. Try setting the executable bit:
PermissionError: [Errno 13] Permission denied: '/opt/hostedtoolcache/Python/3.9.6/x64/lib/python3.9/site-packages/compiler_gym/third_party/csmith/csmith/bin/csmith'
@@ -302,6 +302,7 @@ jobs:
wheel unpack *.whl
rm *.whl
chmod +x compiler_gym-llvm-service
+ chmod +x compiler_gym-*/compiler_gym-*.data/purelib/compiler_gym/third_party/csmith/csmith/bin/csmith
mv compiler_gym-llvm-service compiler_gym-*/compiler_gym-*.data/purelib/compiler_gym/envs/llvm/service/compiler_gym-llvm-service
wheel pack compiler_gym-*
