Bug#100206: sigc++.m4 broken with current autoconf (workaround)

[grib@linuxdevel.com (Bill Gribble)]

Package: libsigc++-dev
Version: 1.0.3-1

Software using libsigc++ won't configure with any recent version of
autoconf due to bugs in autoconf.  

This one-line patch to /usr/share/aclocal/sigc++.m4 fixes the problem
for broken versions of autoconf and should be a noop for working
versions of autoconf.

Thanks,
Bill Gribble

*** sigc++.m4~	Tue Mar  6 08:37:31 2001
--- sigc++.m4	Sat Jun  9 08:35:43 2001
***************
*** 107,112 ****
--- 107,113 ----
        AC_MSG_CHECKING(if libsigc++ sane)
        ac_save_CXXFLAGS="$CXXFLAGS"
        ac_save_LIBS="$LIBS"
+       ac_exeext=""
        CXXFLAGS="$CXXFLAGS $SIGC_CFLAGS"
        LIBS="$LIBS $SIGC_LIBS"