build: use path.join() for objdir
build: use path.join() for objdir

use path.join() to set objdir.

Signed-off-by: Tomi Valkeinen <e1ca4dbb8be1acaf20734fecd2da10ed1d46a9bb@iki.fi>

inordertotest/CppSharp,ktopouzi/CppSharp,xistoso/CppSharp,mohtamohit/CppSharp,imazen/CppSharp,genuinelucifer/CppSharp,zillemarco/CppSharp,mohtamohit/CppSharp,SonyaSa/CppSharp,mohtamohit/CppSharp,Samana/CppSharp,imazen/CppSharp,ktopouzi/CppSharp,inordertotest/CppSharp,nalkaro/CppSharp,u255436/CppSharp,zillemarco/CppSharp,zillemarco/CppSharp,genuinelucifer/CppSharp,imazen/CppSharp,mydogisbox/CppSharp,zillemarco/CppSharp,imazen/CppSharp,KonajuGames/CppSharp,txdv/CppSharp,inordertotest/CppSharp,mohtamohit/CppSharp,Samana/CppSharp,txdv/CppSharp,zillemarco/CppSharp,SonyaSa/CppSharp,nalkaro/CppSharp,ktopouzi/CppSharp,Samana/CppSharp,u255436/CppSharp,inordertotest/CppSharp,KonajuGames/CppSharp,Samana/CppSharp,imazen/CppSharp,KonajuGames/CppSharp,ddobrev/CppSharp,nalkaro/CppSharp,txdv/CppSharp,u255436/CppSharp,txdv/CppSharp,xistoso/CppSharp,xistoso/CppSharp,u255436/CppSharp,ddobrev/CppSharp,mydogisbox/CppSharp,genuinelucifer/CppSharp,ddobrev/CppSharp,ddobrev/CppSharp,mono/CppSharp,ddobrev/CppSharp,genuinelucifer/CppSharp,mydogisbox/CppSharp,genuinelucifer/CppSharp,SonyaSa/CppSharp,u255436/CppSharp,mono/CppSharp,SonyaSa/CppSharp,mydogisbox/CppSharp,txdv/CppSharp,nalkaro/CppSharp,mohtamohit/CppSharp,nalkaro/CppSharp,xistoso/CppSharp,mono/CppSharp,ktopouzi/CppSharp,mono/CppSharp,mono/CppSharp,inordertotest/CppSharp,ktopouzi/CppSharp,KonajuGames/CppSharp,Samana/CppSharp,xistoso/CppSharp,mono/CppSharp,KonajuGames/CppSharp,mydogisbox/CppSharp,SonyaSa/CppSharp