Update git submodules

* Update prebuilts/clang/host/linux-x86 from branch 'master'
  to 7766d68e0c21ce9c2f25c57cdf2565a85a491bc5
  - Remove unused clang-r445002
    
    Test: N/A
    Change-Id: Ifb1658e31bdfca5fc7f0fcf12470663cc232449d
    
1 file changed