[spi-hdlc-adapter] fix compilation on Alpine Linux with musl libc (#2712)
[spi-hdlc-adapter] fix compilation on Alpine Linux with musl libc (#2712)

Without linux/ioctl.h compilation fails on this platform,
because _IOC_SIZEBITS will not be defined.
abtink/openthread,jwhui/openthread,LeZhang2016/openthread,gandreello/openthread,erja-gp/openthread,LeZhang2016/openthread,lanyuwen/openthread,openthread/openthread,abtink/openthread,srickardti/openthread,georgecpr/openthread,mszczodrak/openthread,librasungirl/openthread,bukepo/openthread,mszczodrak/openthread,gandreello/openthread,librasungirl/openthread,LeZhang2016/openthread,erja-gp/openthread,abtink/openthread,lanyuwen/openthread,gandreello/openthread,chshu/openthread,turon/openthread,jwhui/openthread,bukepo/openthread,mszczodrak/openthread,librasungirl/openthread,jwhui/openthread,georgecpr/openthread,mszczodrak/openthread,lanyuwen/openthread,jwhui/openthread,georgecpr/openthread,erja-gp/openthread,erja-gp/openthread,turon/openthread,chshu/openthread,openthread/openthread,srickardti/openthread,erja-gp/openthread,openthread/openthread,mszczodrak/openthread,gandreello/openthread,LeZhang2016/openthread,mszczodrak/openthread,bukepo/openthread,gandreello/openthread,chshu/openthread,lanyuwen/openthread,chshu/openthread,LeZhang2016/openthread,turon/openthread,openthread/openthread,georgecpr/openthread,georgecpr/openthread,turon/openthread,chshu/openthread,librasungirl/openthread,erja-gp/openthread,chshu/openthread,georgecpr/openthread,srickardti/openthread,lanyuwen/openthread,lanyuwen/openthread,LeZhang2016/openthread,bukepo/openthread,gandreello/openthread,srickardti/openthread,abtink/openthread