Replace obsolescent %hs printf specifier
https://github.com/audacity/audacity/commit/e181ee115e727b4754619b04aa6e8ad872113592

Index: locale/bg.po
--- locale/bg.po.orig
+++ locale/bg.po
@@ -2328,7 +2328,7 @@ msgstr "Не бе възможно да се отво�
 #: libraries/lib-xml/XMLFileReader.cpp
 #, fuzzy, c-format
 msgid "Error: %s at line %lu"
-msgstr "Грешка: %hs на ред %lu"
+msgstr "Грешка: %s на ред %lu"
 
 #: libraries/lib-xml/XMLFileReader.cpp
 #, c-format