Disable two warnings for old Amber versions

Disable two warnings for old Amber versions

Older versions of Amber fail to build with Clang >= 11 and GCC >=11 due
-Werror and warnings that have been fixed in later versions. Upgrading
Amber in older CTS branches risks accidental downgrades during fix
propagation. This change disables -Wsuggest-destructor-override for
Clang and -Wuninitialized for GCC when building libamber. These
should be re-enabled in newer Vulkan CTS releases.

Components: Framework, Vulkan

VK-GL-CTS issue: 3361

Change-Id: Ifc2ed69584d8ad179042b80212e02ceb9956d110