spinel: Don't use `struct in6_addr` for `spinel_ipv6addr_t` (#133)
spinel: Don't use `struct in6_addr` for `spinel_ipv6addr_t` (#133)

This struct is not available on most embedded platforms.

This commit addresses issue #121
georgecpr/openthread,jjlee9/openthread,turon/openthread,mszczodrak/openthread,nibanks/openthread,LeZhang2016/openthread,jjlee9/openthread,LeZhang2016/openthread,GiedriusM/openthread,JakubBrachTieto/openthread,nibanks/openthread,jjlee9/openthread,librasungirl/openthread,vaas-krish/openthread,erja-gp/openthread,GiedriusM/openthread,fbsder/openthread,chshu/openthread,erja-gp/openthread,fbsder/openthread,aeliot/openthread,jwhui/openthread,srickardti/openthread,Zolertia/openthread,turon/openthread,pvanhorn/openthread,openthread/openthread,GiedriusM/openthread,georgecpr/openthread,fbsder/openthread,xiaom-GitHub/openthread,gandreello/openthread,jjlee9/openthread,xiaom-GitHub/openthread,lanyuwen/openthread,pvanhorn/openthread,mszczodrak/openthread,srickardti/openthread,lanyuwen/openthread,xiaom-GitHub/openthread,lanyuwen/openthread,fbsder/openthread,LeZhang2016/openthread,openthread/openthread,gandreello/openthread,erja-gp/openthread,pvanhorn/openthread,librasungirl/openthread,GiedriusM/openthread,pvanhorn/openthread,jwhui/openthread,fbsder/openthread,xiaom-GitHub/openthread,aeliot/openthread,chshu/openthread,openthread/openthread,Zolertia/openthread,erja-gp/openthread,georgecpr/openthread,chshu/openthread,JakubBrachTieto/openthread,LeZhang2016/openthread,aeliot/openthread,pvanhorn/openthread,lanyuwen/openthread,jwhui/openthread,LeZhang2016/openthread,bukepo/openthread,librasungirl/openthread,jjlee3/openthread,JakubBrachTieto/openthread,vaas-krish/openthread,erja-gp/openthread,mszczodrak/openthread,chshu/openthread,jjlee3/openthread,gandreello/openthread,aeliot/openthread,erja-gp/openthread,vaas-krish/openthread,lanyuwen/openthread,LeZhang2016/openthread,jjlee3/openthread,jjlee3/openthread,jwhui/openthread,JakubBrachTieto/openthread,bukepo/openthread,JakubBrachTieto/openthread,abtink/openthread,nibanks/openthread,chshu/openthread,vaas-krish/openthread,vaas-krish/openthread,lanyuwen/openthread,mszczodrak/openthread,nibanks/openthread,mszczodrak/openthread,nibanks/openthread,abtink/openthread,vaas-krish/openthread,nibanks/openthread,turon/openthread,georgecpr/openthread,fbsder/openthread,abtink/openthread,JakubBrachTieto/openthread,gandreello/openthread,jjlee9/openthread,openthread/openthread,pvanhorn/openthread,aeliot/openthread,turon/openthread,srickardti/openthread,GiedriusM/openthread,xiaom-GitHub/openthread,georgecpr/openthread,bukepo/openthread,bukepo/openthread,georgecpr/openthread,jjlee9/openthread,xiaom-GitHub/openthread,gandreello/openthread,srickardti/openthread,librasungirl/openthread,Zolertia/openthread,aeliot/openthread,jjlee3/openthread,Zolertia/openthread,abtink/openthread,Zolertia/openthread,gandreello/openthread,chshu/openthread,mszczodrak/openthread