cross compile fix by (allanc at chickenandporn dot com)

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@3384 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -799,7 +799,11 @@ EOF
 have_lrintf="no"
 if $cc $extralibs -o $TMPE $TMPC 2> /dev/null ; then
   have_lrintf="yes"
+  # allanc@chickenandporn.com: cannot execute cross-compiled
+  # code on the host.  Only execute if not cross-compiling.
+  if test -z "$cross_prefix" ; then
     $TMPE 2> /dev/null > /dev/null || have_lrintf="no"
+  fi
 fi
 
 _restrict=