[PATCH] changed the -x switch to print only non-ascii chars in hexadecimal

[rae l]

Now the -x and -xx switches are almost the same:
-x switch to search a non-ascii char and print the whole string in
hexadecimal if find one;
-xx switch to direct print the whole string in hexdecimal.

but sometimes we need only print the non-ascii chars in hexadecimal,
neither the whole string as -x does, nor the default octal, so I
changed the -x behavior:

one running example:

	./strace -x /usr/bin/echo -e "\7\1\x1fhello, world"

	write(1, "\x07\x01\x1fhello, world\n", 16  hello, world

-- 
Denis Cheng
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