Use POSIX locale

This should always exist

Author: thomaskrause

graphannis/src/annis/db/sort_matches.rs

@@ -255,7 +255,7 @@ mod tests {
         use std::time::Duration;
 
         unsafe {
-            let locale = CString::new("en_US.utf8").unwrap_or_default();
+            let locale = CString::new("POSIX").unwrap_or_default();
             libc::setlocale(libc::LC_COLLATE, locale.as_ptr());
             std::thread::sleep(Duration::from_millis(500));
         }

verify.sh

@@ -7,7 +7,7 @@ set -e
 cargo fmt --check
 cargo clippy
 
-export LANG="en_US.utf8"
+export LANG="POSIX"
 
 # Execute tests and calculate the code coverage both as lcov and HTML report
 cargo llvm-cov clean --workspace