Attempt again

Author: tstellar

.github/workflows/release-binaries.yml

@@ -282,6 +282,7 @@ jobs:
       env:
         VCPKG_BUILD_TYPE: release
         VCPKG_CMAKE_CONFIGURE_OPTIONS: -DLIBXML2_WITH_ZLIB=OFF -DLIBXML2_WITH_ICONV=OFF 
+        VCPKG_ENV_PASSTHROUGH: VCPKG_CMAKE_CONFIGURE_OPTIONS
       run: |
         vcpkg install libxml2:x64-windows-static
         #find / -iname 'libxml*.lib'