It uses the native Secure Transport API rather than GnuTLS.

dbghelp: For the internal functions on x86_64 stack unwinding, only rely on CONTEXT information, and manage STACKFRAME64 updates in outer functions.

dbghelp: In msc unwinding code (from FPO extended data), take care of cases where several variables are stored in the same hash.

dbghelp: When doing a stack backtrace on i386 with dwarf or pdb unwinders, get the PC from the right frame.

dbghelp: In dwarf unwinder, fix the last valid IP value to be used for a given line of Call Frame Information.