Add warning for not cloning gtest submodule
Add warning for not cloning gtest submodule

HolyGeneralK/arrayfire,shehzan10/arrayfire,unbornchikken/arrayfire,linan7788626/arrayfire,Keno/arrayfire,jramapuram/arrayfire,jramapuram/arrayfire,glehmann/arrayfire,ghisvail/arrayfire,Keno/arrayfire,shehzan10/arrayfire,glehmann/arrayfire,HolyGeneralK/arrayfire,hshindo/arrayfire,unbornchikken/arrayfire,merlin-ext/arrayfire,merlin-ext/arrayfire,shehzan10/arrayfire,pombredanne/arrayfire,hshindo/arrayfire,bkloppenborg/arrayfire,pombredanne/arrayfire,Keno/arrayfire,linan7788626/arrayfire,Keno/arrayfire,victorv/arrayfire,jramapuram/arrayfire,pentschev/arrayfire,victorv/arrayfire,hshindo/arrayfire,victorv/arrayfire,asifmadnan/arrayfire,marbre/arrayfire,umar456/arrayfire,arrayfire/arrayfire,jramapuram/arrayfire,umar456/arrayfire,merlin-ext/arrayfire,arrayfire/arrayfire,9prady9/arrayfire,marbre/arrayfire,shehzan10/arrayfire,9prady9/arrayfire,pombredanne/arrayfire,linan7788626/arrayfire,linan7788626/arrayfire,marbre/arrayfire,unbornchikken/arrayfire,bkloppenborg/arrayfire,hshindo/arrayfire,munnybearz/arrayfire,pombredanne/arrayfire,pentschev/arrayfire,bkloppenborg/arrayfire,ghisvail/arrayfire,arrayfire/arrayfire,mrgloom/arrayfire,umar456/arrayfire,mrgloom/arrayfire,umar456/arrayfire,bkloppenborg/arrayfire,asifmadnan/arrayfire,asifmadnan/arrayfire,HolyGeneralK/arrayfire,asifmadnan/arrayfire,unbornchikken/arrayfire,marbre/arrayfire,9prady9/arrayfire,9prady9/arrayfire,victorv/arrayfire,ghisvail/arrayfire,pentschev/arrayfire,mrgloom/arrayfire,merlin-ext/arrayfire,munnybearz/arrayfire,ghisvail/arrayfire,mrgloom/arrayfire,munnybearz/arrayfire,HolyGeneralK/arrayfire,arrayfire/arrayfire,pentschev/arrayfire