glibc's and musl's strerror for EOVERFLOW are different...

--- a/tests/test-commit-timestamp.sh
+++ b/tests/test-commit-timestamp.sh
@@ -40,6 +40,6 @@
 ${CMD_PREFIX} ostree --repo=./testrepo show env > show-env.txt
 rm -rf testrepo testrepo-files
 assert_file_has_content_literal commit-invalid.txt 'Failed to convert SOURCE_DATE_EPOCH'
-assert_file_has_content_literal commit-overflowing.txt 'Parsing SOURCE_DATE_EPOCH: Numerical result out of range'
+assert_file_has_content_literal commit-overflowing.txt 'Parsing SOURCE_DATE_EPOCH:'
 assert_file_has_content_literal show-env.txt 'Date:  2009-02-13 23:31:30 +0000'
 echo "ok commit with env timestamp"
