Fix ruby hooks when --format-executable is in gemrc
I used this gemrc to break things (default on opensuse):
```yaml
benchmark: false
install: --format-executable --no-user-install
install: --format-executable --no-user-install
backtrace: true
update_sources: true
format_executable: true
verbose: true
update: --format-executable --no-user-install
update: --format-executable --no-user-install
bulk_threshold: 1000
sources:
```
@@ -134,7 +134,8 @@ def install_environment(
helpers.run_setup_cmd(
prefix,
(
- 'gem', 'install', '--no-document',
+ 'gem', 'install',
+ '--no-document', '--no-format-executable',
*prefix.star('.gem'), *additional_dependencies,
),
)
