Log Message:
Update to 3.12.0:

    version 3.12.0

    gnome-autogen.sh: Fix check if stdin is a tty

    Commit 7f977b021462 introduced a check if stdin is ins't a tty, and
    prevent printing terminal codes in this case. But the check was wrong
    and always failed.

    https://bugzilla.gnome.org/show_bug.cgi?id=726892

    gnome-autogen: require automake 1.11.2

    This is the version of automake that introduced ACLOCAL_PATH support, so
    make sure that we have it before attempting to configure the package.

    gnome-common: use ACLOCAL_PATH over ACLOCAL_FLAGS

    jhbuild has set this variable for more than two years.

    https://bugzilla.gnome.org/show_bug.cgi?id=726208

    gnome-autogen.sh: correct IFS value

    Due to a likely copy-paste mistake, the default value of IFS was being
    set to 9 spaces instead of a tab and a space.  Fix that.

    https://bugzilla.gnome.org/show_bug.cgi?id=726208

    gnome-autogen.sh: Check for appdata-xml.m4 with APPDATA_XML

    compiler-flags: Simplify a case statement slightly

    compiler-flags: Replace deprecated AC_HELP_STRING with AS_HELP_STRING

    Read the dirlist file unconditionally