[gawk] printf does not recognize .PREC if locale is en_US.UTF-8

[tczy]

*** ISSUE AND HOW TO REPRODUCE (IT): ***

echo nothing | awk '{printf "%.3s", "foobar"}'

produces 'foobar' if LC_ALL is en_US.UTF-8. Other variations of the same
program (with awk 'BEGIN{printf ...', etc.) produce the same. If LC_ALL
is set to C, everything is fine.

awk '{a=sprintf("%.3s", "foobar"); print a}'

also has this issue.

IRC reports 3.1.5 working well with UTF locale.

*** SYSTEM INFO ***

% gawk --version
GNU Awk 3.1.7

% uname -a
Linux sidep.ath.cx 2.6.31-ARCH #1 SMP PREEMPT Tue Nov 10 19:01:40 CET 2009 
x86_64 Intel(R) Core(TM)2 Duo CPU T5670 @ 1.80GHz GenuineIntel GNU/Linux

Also GLibC 2.11.1.

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