strptime: avoid compiler warnings Reported against mingw, but reproduced on glibc with: CFLAGS='-Wall -Wunused-label -Wunused-variable' \ ac_cv_func_strptime=no ./gnulib-tool --with-tests --test strptime * lib/strptime.c (__strptime_internal) [!_NL_CURRENT]: Avoid compiler warnings about dead code. Reported by Daniel P. Berrange. Signed-off-by: Eric Blake <eblake@redhat.com>