Drop remaining BUILD_BROKEN_NINJA_USES_ENV_VARS

All of them were used exclusively by the proprietary Qualcomm build
system. We're using prebuilts of proprietary components in the current
tree, so drop those legacy configurations.

Issue: FP3-A11#181
Change-Id: Ic3f3ef6cd4bff3beed1b73bc1db9ac7c825bb971
1 file changed