Only check for valid Xcode path when run on Mac (#11045)
Only check for valid Xcode path when run on Mac (#11045)

spec_helper.rb: Only check for valid Xcode path on Mac

fixes #11044
mbogh/fastlane,javibm/fastlane,jaleksynas/fastlane,icecrystal23/fastlane,nafu/fastlane,marcelofabri/fastlane,cpk1/fastlane,luongm/fastlane,nafu/fastlane,bassrock/fastlane,kazuhidet/fastlane,taquitos/fastlane,kazuhidet/fastlane,KrauseFx/fastlane,mgrebenets/fastlane,marcelofabri/fastlane,joshdholtz/fastlane,lacostej/fastlane,bassrock/fastlane,allewun/fastlane,joshdholtz/fastlane,nafu/fastlane,mgrebenets/fastlane,hjanuschka/fastlane,marcelofabri/fastlane,manuyavuz/fastlane,ExtremeMan/fastlane,bolom/fastlane,manuyavuz/fastlane,allewun/fastlane,keatongreve/fastlane,revile/fastlane,joshdholtz/fastlane,daveanderson/fastlane,joshdholtz/fastlane,bassrock/fastlane,lacostej/fastlane,farkasseb/fastlane,marcelofabri/fastlane,KrauseFx/fastlane,lacostej/fastlane,bolom/fastlane,hjanuschka/fastlane,marcelofabri/fastlane,revile/fastlane,tmtrademarked/fastlane,fastlane/fastlane,mbogh/fastlane,orta/fastlane,cpk1/fastlane,ExtremeMan/fastlane,cpk1/fastlane,mbogh/fastlane,daveanderson/fastlane,marcelofabri/fastlane,KrauseFx/fastlane,luongm/fastlane,hjanuschka/fastlane,tmtrademarked/fastlane,KrauseFx/fastlane,icecrystal23/fastlane,bassrock/fastlane,Econa77/fastlane,cpk1/fastlane,javibm/fastlane,ashfurrow/fastlane,manuyavuz/fastlane,mbogh/fastlane,brbulic/fastlane,adamcohenrose/fastlane,mgrebenets/fastlane,mgrebenets/fastlane,joshdholtz/fastlane,nafu/fastlane,farkasseb/fastlane,farkasseb/fastlane,farkasseb/fastlane,taquitos/fastlane,allewun/fastlane,bolom/fastlane,taquitos/fastlane,KrauseFx/fastlane,Econa77/fastlane,revile/fastlane,ashfurrow/fastlane,bassrock/fastlane,brbulic/fastlane,mgrebenets/fastlane,farkasseb/fastlane,farkasseb/fastlane,javibm/fastlane,cpk1/fastlane,luongm/fastlane,taquitos/fastlane,adamcohenrose/fastlane,tmtrademarked/fastlane,taquitos/fastlane,adamcohenrose/fastlane,luongm/fastlane,ExtremeMan/fastlane,ashfurrow/fastlane,hjanuschka/fastlane,nafu/fastlane,hjanuschka/fastlane,nafu/fastlane,nafu/fastlane,adamcohenrose/fastlane,tmtrademarked/fastlane,icecrystal23/fastlane,mbogh/fastlane,mbogh/fastlane,fastlane/fastlane,bassrock/fastlane,taquitos/fastlane,Econa77/fastlane,revile/fastlane,mgrebenets/fastlane,brbulic/fastlane,joshdholtz/fastlane,ExtremeMan/fastlane,Econa77/fastlane,jaleksynas/fastlane,ashfurrow/fastlane,jaleksynas/fastlane,keatongreve/fastlane,manuyavuz/fastlane,luongm/fastlane,daveanderson/fastlane,ExtremeMan/fastlane,fastlane/fastlane,daveanderson/fastlane,bolom/fastlane,Econa77/fastlane,marcelofabri/fastlane,luongm/fastlane,brbulic/fastlane,jaleksynas/fastlane,kazuhidet/fastlane,lacostej/fastlane,taquitos/fastlane,bolom/fastlane,adamcohenrose/fastlane,kazuhidet/fastlane,lacostej/fastlane,ashfurrow/fastlane,KrauseFx/fastlane,keatongreve/fastlane,brbulic/fastlane,kazuhidet/fastlane,daveanderson/fastlane,kazuhidet/fastlane,manuyavuz/fastlane,allewun/fastlane,kohtenko/fastlane,javibm/fastlane,jaleksynas/fastlane,revile/fastlane,hjanuschka/fastlane,jaleksynas/fastlane,mbogh/fastlane,javibm/fastlane,luongm/fastlane,hjanuschka/fastlane,allewun/fastlane,adamcohenrose/fastlane,ashfurrow/fastlane,kohtenko/fastlane,joshdholtz/fastlane,fastlane/fastlane,fastlane/fastlane,daveanderson/fastlane,keatongreve/fastlane,brbulic/fastlane,bolom/fastlane,icecrystal23/fastlane,ExtremeMan/fastlane,mgrebenets/fastlane,Econa77/fastlane,icecrystal23/fastlane,KrauseFx/fastlane,keatongreve/fastlane,bolom/fastlane,javibm/fastlane,tmtrademarked/fastlane,ashfurrow/fastlane,kazuhidet/fastlane,tmtrademarked/fastlane,allewun/fastlane,tmtrademarked/fastlane,lacostej/fastlane,javibm/fastlane,orta/fastlane,cpk1/fastlane,farkasseb/fastlane,Econa77/fastlane,fastlane/fastlane,icecrystal23/fastlane,daveanderson/fastlane,adamcohenrose/fastlane,ExtremeMan/fastlane,manuyavuz/fastlane,revile/fastlane,manuyavuz/fastlane,jaleksynas/fastlane,keatongreve/fastlane,cpk1/fastlane,allewun/fastlane,brbulic/fastlane,keatongreve/fastlane,revile/fastlane