SERVER-12273 Remove RCAR
SERVER-13446 Add timegm Solaris implementation to third_party
SERVER-13899 Remove unused stripInvalidAssignmentsTo2dsphereIndex arg
Revert "SERVER-13446 Add timegm Solaris implementation to third_party"

This reverts commit 5a44bf386eaba7d18a142206868bdbab15432eea.
Reason: time_support_test.cpp fails on Linux 32/Linux 32 DEBUG.