Partially reverts
https://github.com/TileDB-Inc/TileDB/commit/5997aff8fc1c6480ddc91341916aea0001944a27

--- a/cmake/Options/BuildOptions.cmake
+++ b/cmake/Options/BuildOptions.cmake
@@ -50,7 +50,7 @@
 endif()
 
 if (NOT TILEDB_VCPKG)
-  message(FATAL_ERROR "Disabling TILEDB_VCPKG is not supported. To disable automatically downloading vcpkg, enable the TILEDB_DISABLE_AUTO_VCPKG option, or set ENV{TILEDB_DISABLE_AUTO_VCPKG} to any value.")
+  message(DEPRECATION "Disabling TILEDB_VCPKG is not supported. To disable automatically downloading vcpkg, enable the TILEDB_DISABLE_AUTO_VCPKG option, or set ENV{TILEDB_DISABLE_AUTO_VCPKG} to any value.")
 endif()
 
 if (TILEDB_HDFS)