MDEV-3799 Windows WITH_ZLIB=bundled build errors with hashicorp_key_management

We compile curl with vcpkg. vcpkg prefers dependencies of the vcpkg
package to come from vcpkg as well. We break its logic by setting
and ZLIB_LIBRARY in cmake/zlib.cmake to the static library that we
compile outselves. This vcpkg check is not critical or needed
when shared libraries are used.

As a workaround, set CMAKE_DISABLE_FIND_PACKAGE_ZLIB when compiling
hashicorp_key_management, in this case vcpkg skips the zlib check.

Author: vaintroub

plugin/hashicorp_key_management/CMakeLists.txt

@@ -1,3 +1,6 @@
+IF(VCPKG_INSTALLED_DIR AND (WITH_ZLIB STREQUAL "bundled"))
+  SET(CMAKE_DISABLE_FIND_PACKAGE_ZLIB 1)
+ENDIF()
 FIND_PACKAGE(CURL)
 IF(NOT CURL_FOUND)
   # Can't build plugin