Removing `const char* wuffs_base__note__i_o_redirect = "@base: I/O redirect";` removes not only the literal string, but also a global non-constant pointer. This perhaps affects various optimizations.

They should have used `const char* wuffs_base__note__i_o_redirect const =` or (preferably) `const char wuffs_base__note__i_o_redirect[] =`.