Don't request concrete comparison operators

operator>= has been removed in recent libc++ and replaced by operator<=>
It's still okay to use operator ">=", but not "operator>=" symbol.

Bug: 175635923
Test: m MODULES-IN-frameworks-av-media-utils
Change-Id: I0a1c5a4f3348a5ff2339c65b799accd7e331f49a