Add workaround for early 2015 builds not having the arm64-simulator entry in getBuildConfiguration.
Add workaround for early 2015 builds not having the arm64-simulator entry in getBuildConfiguration.

MozillaSecurity/funfuzz,MozillaSecurity/funfuzz,MozillaSecurity/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz