AS_ECHO_N in util-macros

[Jon TURNEY]

On 14/02/2012 16:29, Gaetan Nadon wrote:
> On 12-02-13 06:13 PM, Jeremy Huddleston wrote:
>> I just noticed this when using autoconf-2.61 ... does AS_ECHO_N require a newer version of autoconf?  Can we work around that requirement?
>>
>> ...
>> configure:4924: error: possibly undefined macro: AS_ECHO_N
>>       If this token and others are legitimate, please use m4_pattern_allow.
>>       See the Autoconf documentation.
>> autoreconf: /usr/bin/autoconf failed with exit status: 1
>> ...
> The AS_ECHO_N macro was introduced in 2.62. This information is not
> written in the autoconf manual, so it is very difficult to catch.
> 
> I think we can use AS_ECHO as the string is not sent to stdout but
> stored in a variable. There is therefore no new line to suppress.

Yes, it seems I was excessively cautious in using AS_ECHO_N and AS_ECHO should
be fine, if backticks remove trailing newlines.

Attached is a patch for review.
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