[LyX/2.3-staging] Fix linking with autotools and mingw-64

[Georg Baum]

commit 9ed251ed918cbdda9965dbfaeaf6adc256c9e794
Author: Shankar Giri Venkita Giri <gir...@gmx.com>
Date:   Thu May 5 12:58:01 2016 +0200

    Fix linking with autotools and mingw-64
    
    ole32.lib is not linked automatically, but needed for mingw-64.
    Patch by Shankar Giri Venkita Giri (bug 10053).

diff --git a/configure.ac b/configure.ac
index 159b3f5..3f6b89c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -116,6 +116,7 @@ AC_SUBST(LIBSHLWAPI)
 AC_CHECK_LIB(psapi, main, [LIBPSAPI=-lpsapi])
 AC_SUBST(LIBPSAPI)
 AC_CHECK_LIB(gdi32, main)
+AC_CHECK_LIB(ole32, main)
 
 LYX_USE_INCLUDED_BOOST
 LYX_USE_INCLUDED_MYTHES