In Qt 5.15 an enumeration is introduced which has enumerators
True and False, used like QCborSimpleType::False. In C++ that's
3 tokens, one name. The C Preprocessor deals with tokens, though,
and since some headers #define False 0, we end up with tokens
QCborSimpleType::0 instead, which is nonsense.
The actual defines are only relevant in C code internals, not the
API for lzma that is used from C++. So somewhat-hackishly just switch
off the #defines when in C++ mode.
The change is complicated by this *particular* source file being
in DOS CRLF mode.
Reported by: tcberner
b01da5e68f