nstrftime: merge glibc strftime changes This incorporates: 2019-02-11 Fix a few whitespace arrangement inconsistencies 2019-01-24 strftime: Pass flags from "%EY" to "%Ey" [BZ #24096] 2019-01-24 Set the default width of "%Ey" to 2 [BZ #23758] 2019-01-11 strftime: use the "L_" macro with character literals * lib/nstrftime.c (__strftime_internal): New arg yr_spec. All callers changed. Default width of %Ey is now 2. This is needed for proper handling of Japanese dates starting on 2019-05-01.