testcase/kernel/tc_libc_timer : Add CONFIG specific buffer check line
testcase/kernel/tc_libc_timer : Add CONFIG specific buffer check line

If CONFIG_LIBC_LOCALTIME or CONFIG_TIME_EXTENDED is turned on.
The strftime function that receives the %a and %A parameter stores the value associated with st_time.tm_wday in buffer instead of "Day".
So I added a #if line to handle this.

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