ACK: [PATCH Wily SRU] x86/entry/compat: Add missing CLAC to entry_INT80_32

[Kamal Mostafa]

ACK for Wily: Cherry-pick of a cc stable commit.

Note: this appears to be needed for [T,U,V] as well, but would need
backporting to stable releases < 4.2.

 -Kamal