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420dff80b5
QNX provides cxxabi.h from LLVM libc++abi, which does not declare __cxa_get_globals but provides its implementation in the library. To make things more fun, QNX developers commented _LIBCPPABI_VERSION definition, which breaks detection of libc++abi in uncaught_exceptions.hpp. There is also cxxabi.h from glibcxx that does provide __cxa_get_globals declaration. We want to use that declaration, if possible, to avoid possible mismatch in attributes. This commit adds non-glibcxx cxxabi.h on QNX to the list of platforms that need our declaration of __cxa_get_globals. Fixes https://github.com/boostorg/core/issues/59.