graphics/vulkan-tools: drop unused dependencies after 352134d8157e

$ poudriere testport -j 131amd64 graphics/vulkan-tools
[...]
=>> Checking shared library dependencies

• 0x0000000000000001 NEEDED Shared library: [libICE.so.6]
• 0x0000000000000001 NEEDED Shared library: [libSM.so.6] 0x0000000000000001 NEEDED Shared library: [libX11.so.6]
• 0x0000000000000001 NEEDED Shared library: [libXext.so.6] 0x0000000000000001 NEEDED Shared library: [libc++.so.1] 0x0000000000000001 NEEDED Shared library: [libc.so.7] 0x0000000000000001 NEEDED Shared library: [libcxxrt.so.1] 0x0000000000000001 NEEDED Shared library: [libgcc_s.so.1] 0x0000000000000001 NEEDED Shared library: [libm.so.5] 0x0000000000000001 NEEDED Shared library: [librt.so.1] 0x0000000000000001 NEEDED Shared library: [libvulkan.so.1] 0x0000000000000001 NEEDED Shared library: [libwayland-client.so.0] 0x0000000000000001 NEEDED Shared library: [libxcb.so.1]