Avoid duplicate definition of git_http_auth_dummy. by JohannesWilde · Pull Request #7077 · libgit2/libgit2

src\libgit2\transports\auth_negotiate.h redefines git_http_auth_negotiate as git_http_auth_dummy if GIT_AUTH_NEGOTIATE is not defined, which thus leads to the uncommented code actually being a redifintion of git_http_auth_dummy. The linker complained [Windows 11, MSVC 2022 64bit].

Avoid defining `git_http_auth_ntlm` when not using ntlm; this will be
set to a dummy function instead.