• Clarify documentation (fd.o #35182, Simon McVittie)
• Clean up minor dead code and some incorrect error handling
(fd.o #33128, fd.o #29881; Simon McVittie)
+ • Check that compiler options are supported before using them (fd.o #19681,
+ Simon McVittie)
• Windows:
• Remove obsolete workaround for winioctl.h (fd.o #35083, Ralf Habacker)