[BUILD] Remove benchmark overlay for vcpkg (#2695)

Author: ThomsonTan

ci/ports/benchmark/portfile.cmake

@@ -10,8 +10,8 @@ $VCPKG_DIR = (Get-Item -Path ".\").FullName
 ./bootstrap-vcpkg.bat
 ./vcpkg integrate install
 
-# Patched Google Benchmark can be shared between vs2017 and vs2019 compilers
-./vcpkg "--vcpkg-root=$VCPKG_DIR" install --overlay-ports="$PSScriptRoot\ports" benchmark:x64-windows
+# Google Benchmark
+./vcpkg "--vcpkg-root=$VCPKG_DIR" install benchmark:x64-windows
 
 # Google Test
 ./vcpkg "--vcpkg-root=$VCPKG_DIR" install gtest:x64-windows