fix: uninstall cleanup

Author: henryiii

.gitignore

@@ -2,6 +2,7 @@ CMakeCache.txt
 CMakeFiles
 Makefile
 cmake_install.cmake
+cmake_uninstall.cmake
 .DS_Store
 *.so
 *.pyd

CMakeLists.txt

@@ -249,7 +249,7 @@ endif()
 
 # Uninstall target
 if(PYBIND11_MASTER_PROJECT)
-  configure_file("${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake_uninstall.cmake.in"
+  configure_file("${CMAKE_CURRENT_SOURCE_DIR}/tools/cmake_uninstall.cmake.in"
                  "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake" IMMEDIATE @ONLY)
 
   add_custom_target(uninstall COMMAND ${CMAKE_COMMAND} -P