2020-12-18  Eli Zaretskii  <eliz@gnu.org>

	Update files for the 27.1.90 pretest

	* README:
	* configure.ac:
	* nt/README.W32:
	* msdos/sed2v2.inp: Bump Emacs version to 27.1.90.
	* lisp/ldefs-boot.el: Update from loaddefs.el

This file records repository revisions from
commit 48b9c47805fc304441017f6ee4c114212cdb0496 (exclusive) to
commit 37eba74d609c74bcf9ac3c481a29377913783ac4 (inclusive).
See ChangeLog.3 for earlier changes.

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