[libdmapsharing] Set required and maximum glib API versions

[W. Michael Petullo <wmpetullo src gnome org>]

commit 396db93bbe5d83f286a24b0f42427f4048f20e86
Author: W. Michael Petullo <mike flyn org>
Date:   Sun Jul 5 09:43:04 2020 -0500

    Set required and maximum glib API versions
    
    Closes #25.

 configure.ac | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/configure.ac b/configure.ac
index 7390f79..68b2cc0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -442,6 +442,10 @@ else
 fi
 AC_SUBST(DMAP_HAVE_UNALIGNED_ACCESS_DEFINE)
 
+dnl Set required and maximum glib API versions.
+AC_DEFINE(GLIB_VERSION_MIN_REQUIRED, GLIB_VERSION_2_40, [minimum glib version])
+AC_DEFINE(GLIB_VERSION_MAX_ALLOWED, GLIB_VERSION_2_40, [maximum glib version])
+
 AC_OUTPUT([
 Makefile
 doc/Makefile