Disable building Qt3 integration by default

Qt3 is deprecated and rarely used, change the default build
configuration not to build it unless --enable-qt3 is passed.

Avahi generally tries not to automatically disable components, requiring
explicit --disable-FEATURE so it's obvious things are being excluded but
we make an exception for outdated/EOL components.

bootstrap.sh

@@ -43,19 +43,19 @@ case `uname -s` in
     export CFLAGS="-I/usr/pkg/include"
     export LDFLAGS="-L/usr/pkg/lib"
     export PKG_CONFIG_PATH="/usr/local/lib/pkgconfig"
-    FLAGS="$FLAGS --disable-monodoc --disable-mono --disable-qt3 --disable-qt4 --disable-xmltoman --prefix=/opt --with-distro=none --disable-python --disable-glib --disable-gtk --disable-manpages"
+    FLAGS="$FLAGS --disable-monodoc --disable-mono --disable-qt4 --disable-xmltoman --prefix=/opt --with-distro=none --disable-python --disable-glib --disable-gtk --disable-manpages"
     ;;
     Linux)
     ;;
 esac
 
 case "$USER" in
     lathiat|trentl)
-    FLAGS="$FLAGS --disable-qt4"
+    FLAGS="$FLAGS"
     ;;
     sebest)
-    FLAGS="$FLAGS --disable-monodoc --enable-dbus=no --enable-mono=no --enable-qt3=no --enable-qt4=no  --sysconfdir=/etc --localstatedir=/var --prefix=/usr  --disable-manpages --disable-xmltoman"
+    FLAGS="$FLAGS --disable-monodoc --enable-dbus=no --enable-mono=no --enable-qt4=no --sysconfdir=/etc --localstatedir=/var --prefix=/usr  --disable-manpages --disable-xmltoman"
     ;;
 esac
 
-CFLAGS="$CFLAGS -g -O0" exec ./autogen.sh $FLAGS "$@" --enable-qt3=no
+CFLAGS="$CFLAGS -g -O0" exec ./autogen.sh $FLAGS "$@"

configure.ac

@@ -480,13 +480,13 @@ GOBJECT_INTROSPECTION_CHECK([0.9.5])
 # Check for Qt 3
 #
 AC_ARG_ENABLE(qt3,
-        AS_HELP_STRING([--disable-qt3],[Disable building of Qt3 mainloop integration]),
+        AS_HELP_STRING([--enable-qt3],[Enable building of Qt3 mainloop integration]),
         [case "${enableval}" in
                 yes) HAVE_QT3=yes ;;
                 no)  HAVE_QT3=no ;;
                 *) AC_MSG_ERROR(bad value ${enableval} for --enable-qt3) ;;
         esac],
-        [HAVE_QT3=yes])
+        [HAVE_QT3=no])
 
 if test "x$HAVE_QT3" = "xyes" ; then
         PKG_CHECK_MODULES( QT3, [ qt-mt >= 3.0.0 ])