Fix small issue with relative path creation on windows
Fix small issue with relative path creation on windows

Do not try to create relative links if both files are
on different drives (no way to reference them relative).

khchanel/libsass,webdev1001/libsass,technoAri/libsass,mtwebster/mint-libsass,technoAri/libsass,mikebarkas/libsass,TBAPI-0KA/NSass,khchanel/libsass,technoAri/libsass,saper/libsass,TBAPI-0KA/NSass,am11/libsass,am11/libsass,panicinc/libsass,errorx666/libsass,mtwebster/mint-libsass,FishingCactus/libsass,FishingCactus/libsass,webdev1001/libsass,khchanel/libsass,TBAPI-0KA/NSass,khchanel/libsass,technoAri/libsass,TBAPI-0KA/NSass,webdev1001/libsass,FishingCactus/libsass,mikebarkas/libsass,am11/libsass,panicinc/libsass,mtwebster/mint-libsass,TBAPI-0KA/NSass,errorx666/libsass,webdev1001/libsass,FishingCactus/libsass,mtwebster/mint-libsass,errorx666/libsass,technoAri/libsass,TBAPI-0KA/NSass,saper/libsass,panicinc/libsass,am11/libsass,mikebarkas/libsass,saper/libsass,FishingCactus/libsass,panicinc/libsass,saper/libsass,panicinc/libsass,webdev1001/libsass,khchanel/libsass,saper/libsass,mikebarkas/libsass,errorx666/libsass,am11/libsass,mtwebster/mint-libsass,mikebarkas/libsass