Fixes for ma_test_recovery.pl on OS X.

storage/maria/unittest/ma_test_recovery.pl:
  .exe is for win32, win64, cygwin but not darwin.
  Some OS X machines have md5 instead of md5sum.

storage/maria/unittest/ma_test_recovery.pl

@@ -42,7 +42,7 @@ sub main
   }
   usage() if ($opt_help || $flag_exit);
 
-  $suffix= ( $^O =~ /win/i ) ? ".exe" : "";
+  $suffix= ( $^O =~ /win/i  && $^O !~ /darwin/i ) ? ".exe" : "";
   $maria_exe_path= "$maria_path/release";
   # we use -f, sometimes -x is unexpectedly false in Cygwin
   if ( ! -f "$maria_exe_path/ma_test1$suffix" )
@@ -68,6 +68,10 @@ sub main
   {
     $md5sum="md5sum";
   }
+  elsif (defined(my_which("md5")))
+  {
+  $md5sum="md5";
+  }
   elsif (defined(my_which("digest")))
   {
   $md5sum="digest -a md5";