Merge from origin/emacs-27

Merge from origin/emacs-27

8aad80d661 Fix installer build
47a73e3e14 Update Windows build documentation
cd55984153 Calc: add missing dynamic variable declarations
e8aa6f19e9 * doc/emacs/buffers.texi (Kill Buffer): Improve indexing.
ccd7cd2c51 Speed up dired-do-find-regexp
7edb1f0773 ; Remove outdated declarations
6ab40c1a51 ; Clarify the assumption
be38e39fcc project--find-regexp-in-files: Support remote files
21c3020fce Document some restrictions for module functions.
e1ce9f3423 Don't recommend using 'module-load' for loading modules.
03f962a486 Port x_get_monitor_attributes_fallback to !HAVE_GTK3
0b32f59764 Fix compilation warning in gnus-start.el