package/libpam-tacplus: remove duplicate LIBPAM_TACPLUS_AUTORECONF

The commit [1] added a second LIBPAM_TACPLUS_AUTORECONF
because we are now patching configure.ac.
But LIBPAM_TACPLUS_AUTORECONF was already used because the
package is fetched from github.

[1] bd85d82f

Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/849509860



Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>