Add free() workaround that causes error when built with some compiler versions.
#573
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…er versions.
Otherwise some building compilers will see errors:
```
error: value of optional type 'UnsafeMutablePointer<CChar>?' (aka 'Optional<UnsafeMutablePointer<Int8>>') must be unwrapped to a value of type 'UnsafeMutablePointer<CChar>' (aka 'UnsafeMutablePointer<Int8>')
for ptr in cstrings { free(ptr) }
```
|
@swift-ci please test |
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Otherwise some building compilers will see errors: