Fix vcpkg find of python libraries

thirdparty/pybind11/tools/FindPythonLibsNew.cmake

@@ -188,8 +188,14 @@ if(CMAKE_HOST_WIN32)
   if(NOT EXISTS "${PYTHON_LIBRARY}")
     get_filename_component(_PYTHON_ROOT ${PYTHON_INCLUDE_DIR} DIRECTORY)
     set(PYTHON_LIBRARY "${_PYTHON_ROOT}/libs/python${PYTHON_LIBRARY_SUFFIX}.lib")
-  elseif(DEFINED VCPKG_TOOLCHAIN AND NOT EXISTS "${PYTHON_LIBRARY}")
-    set(PYTHON_LIBRARY "${PYTHON_PREFIX}/../../lib/python${PYTHON_LIBRARY_SUFFIX}.lib")
+  endif()
+
+  if(DEFINED VCPKG_TOOLCHAIN)
+    unset(PYTHON_LIBRARY)
+    find_library(
+      PYTHON_LIBRARY
+      NAMES "python${PYTHON_LIBRARY_SUFFIX}"
+      NO_SYSTEM_ENVIRONMENT_PATH)
   endif()
 
   # if we are in MSYS & MINGW, and we didn't find windows python lib, look for system python lib