* configure.ac (guile_cv_need_braces_on_pthread_once_init)
(guile_cv_need_braces_on_pthread_mutex_initializer): Add
‘AC_LANG_PROGRAM’ call to first arg of ‘AC_COMPILE_IFELSE’.
These days, Emacs' Autoconf mode has proper support for
‘dnl’ in ‘comment-start’, ‘comment-end’, ‘comment-start-skip’;
we no longer need to specify these explicitly.
* configure.ac: Remove EOF "Local Variables" block.