[accerciser] Fix autoreconf by using variable in PKG_CHECK_MODUlES

[Samuel Thibault <sthibaul src gnome org>]

commit 65e22b61f9f177a24a2c54892b0b2d236b5f57ed
Author: Martin Pieuchot <mpi grenadille net>
Date:   Tue Aug 20 13:03:17 2019 -0300

    Fix autoreconf by using variable in PKG_CHECK_MODUlES

 configure.ac | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index ed58ff2..ce78bce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,9 +19,9 @@ ATSPI_REQUIRED=2.5.2
 GLIB_GSETTINGS
 
 dnl == check for requeriments ==
-PKG_CHECK_MODULES([GTK], [gtk+-3.0 >= GTK_REQUIRED])
-PKG_CHECK_MODULES([PYGOBJECT], [pygobject-3.0 >= PYGOBJECT_REQUIRED])
-PKG_CHECK_MODULES([ATSPI2], [atspi-2 >= ATSPI_REQUIRED])
+PKG_CHECK_MODULES([GTK], [gtk+-3.0 >= $GTK_REQUIRED])
+PKG_CHECK_MODULES([PYGOBJECT], [pygobject-3.0 >= $PYGOBJECT_REQUIRED])
+PKG_CHECK_MODULES([ATSPI2], [atspi-2 >= $ATSPI_REQUIRED])
 
 dnl == i18n ==
 # FIXME: Remove AM_GNU_GETTEXT_VERSION once autoreconf supports REQUIRE_VERSION