Disable getc_unlocked() with MemorySanitizer. (GH-10499)


clang's MemorySanitizer understand getc() but does not understand
getc_unlocked().  Workaround: Don't use it on msan builds.
(cherry picked from commit e6c77d8301ec1703abb755a7d3ce5bd8c999c082)

Co-authored-by: Gregory P. Smith <greg@krypto.org>
1 file changed