Adjust the check for the check test framework to look for libcheck.so
instead of libcheck.a.

This change will be sent upstream.

--- libdnet-1.12/configure.in.orig	2015-05-07 08:14:49.583718066 -0700
+++ libdnet-1.12/configure.in	2015-05-07 08:17:24.526491068 -0700
@@ -131,22 +131,22 @@
      ;;
   *)
      AC_MSG_RESULT($withval)
-     if test -f $withval/include/check.h -a -f $withval/lib/libcheck.a; then
+     if test -f $withval/include/check.h -a -f $withval/lib/libcheck.so; then
         owd=`pwd`
         if cd $withval; then withval=`pwd`; cd $owd; fi
         CHECKINC="-I$withval/include"
         CHECKLIB="-L$withval/lib -lcheck"
-     elif test -f $withval/src/check.h -a -f $withval/src/libcheck.a; then
+     elif test -f $withval/src/check.h -a -f $withval/src/libcheck.so; then
         owd=`pwd`
         if cd $withval; then withval=`pwd`; cd $owd; fi
         CHECKINC="-I$withval/src"
         CHECKLIB="-L$withval/src -lcheck"
      else
-        AC_ERROR(check.h or libcheck.a not found in $withval)
+        AC_ERROR(check.h or libcheck.so not found in $withval)
      fi
      ;;
   esac ],
-[ if test -f ${prefix}/include/check.h -a -f ${prefix}/lib/libcheck.a; then
+[ if test -f ${prefix}/include/check.h -a -f ${prefix}/lib/libcheck.so; then
      CHECKINC="-I${prefix}/include"
      CHECKLIB="-L${prefix}/lib -lcheck"
      AC_MSG_RESULT(yes)