Fix invalid checks for readdir and bcopy.

https://sourceforge.net/p/mcrypt/patches/15/
--- configure.orig
+++ configure
@@ -6639,7 +6639,7 @@ fi
 done
 
 
-for ac_func in readdir,,
+for ac_func in readdir
 do
 as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
 echo "$as_me:$LINENO: checking for $ac_func" >&5
@@ -6741,7 +6741,7 @@ fi
 done
 
 
-for ac_func in bcopy,,
+for ac_func in bcopy
 do
 as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
 echo "$as_me:$LINENO: checking for $ac_func" >&5