[v4] Fix strptime era handling, add more era tests [BZ #24394]

[Andreas Schwab]

https://build.opensuse.org/package/live_build_log/home:Andreas_Schwab:glibc/glibc:testsuite/f/i586
https://build.opensuse.org/package/live_build_log/home:Andreas_Schwab:glibc/glibc:testsuite/p/ppc

tst-strftime3.c: In function 'print_string_hex':
tst-strftime3.c:351:16: error: format '%X' expects argument of type 'unsigned int', but argument 2 has type 'wchar_t' {aka 'long int'} [-Werror=format=]
  printf ("<U%04X>", w[i]);
             ~~~^    ~~~~
             %04lX

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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