7eb27a9cf9
Target modifiers fix for bool flags without value
Fixed support of boolean flags without values: `-Zbool-flag` is now consistent with `-Zbool-flag=true` in another crate.
When flag is explicitly set to default value, target modifier will not be set in crate metainfo (`-Zflag=false` when `false` is a default value for the flag).
Improved error notification when target modifier flag is absent in a crate ("-Zflag unset").
Example:
```
note: `-Zreg-struct-return=true` in this crate is incompatible with unset `-Zreg-struct-return` in dependency `default_reg_struct_return`
```
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| .. | ||
| auxiliary | ||
| defaults_check.error.stderr | ||
| defaults_check.rs | ||
| incompatible_regparm.allow_no_value.stderr | ||
| incompatible_regparm.error_generated.stderr | ||
| incompatible_regparm.rs | ||
| no_value_bool.error.stderr | ||
| no_value_bool.error_explicit.stderr | ||
| no_value_bool.rs | ||
| two_flags.rs | ||
| two_flags.unknown_allowed.stderr | ||