GCC's -Wfree-nonheap-object false-positives on inlined std::vector copies
(GCC PR 104475), breaking -Werror builds with GCC 15 on Ubuntu 26.04. Keep
the warning visible but do not let it fail the build.
AutoVcpkg assumed that the bootstrap file was in the root project
folder, and not in a cmake subfolder.
Note: It is not correct to use ${CMAKE_CURRENT_LIST_DIR} since this is
inside a function and whould still refer to the folder of the calling
file. The more elegant solution would be to use
${CMAKE_CURRENT_FUNCTION_LIST_DIR}, but that is not available until
CMake 3.17.