--enable-api-default-signal-handlers in glibmm 2.10.6

["Matt Hoosier" <mwhoosier gmail com>]

Hi,

The M4 macro (from scripts/reduced.m4) which controls whether default
signal handlers will be exposed as virtual functions seems to have a
typo:

AC_DEFUN([GLIBMM_ARG_ENABLE_API_DEFAULT_SIGNAL_HANDLERS],
[
 AC_ARG_ENABLE([api-exceptions],
     [  --enable-api-default-signal-handlers  Build default signal
handlers API.
                             [[default=yes]]],
     [glibmm_enable_api_default_signal_handlers="$enableval"],
     [glibmm_enable_api_default_signal_handlers='yes'])

 if test "x$glibmm_enable_api_default_signal_handlers" = "xyes"; then
 {
   AC_DEFINE([GLIBMM_DEFAULT_SIGNAL_HANDLERS_ENABLED],[1], [Defined
when the --enable-api-default-signal-handlers configure argument was
given])
 }
 fi
])

Note that the AC_ARG_ENABLE clause uses "api-exceptions" as the
salient bit, when I guess it should probably be
"api-default-signal-handlers". This has the effect that
$glibmm_enable_api_default_signal_handlers never takes on the "yes"
value, and the virtual functions are never enabled.