[elpa] externals/compat updated (f1be1fbdeb -> 503b13f1b1)

[ELPA Syncer]

elpasync pushed a change to branch externals/compat.

      from  f1be1fbdeb Don't test compat--proper-list-p-length-signal prior to 
26.1
       new  c7578e29f2 Use with-eval-after-load for updating default values
       new  839ed32445 Drop :max-version for alist-get in compat-25.1
       new  0039912d8e Remove unknown declare properties for Emacs 24 and prior
       new  f57791877f Use nth/nthcdr instead of cad+r/cdd+r if possible
       new  1a53971919 Abbreviate doc-string for lookup-key advice
       new  711d678361 Fix eval-after-load call for delayed compatibility code
       new  0125f90e64 Declare json-parse-string in compat-27.1
       new  503b13f1b1 Add compat-help as an infrastructure to manage relevant 
notes


Summary of changes:
 Makefile       |  3 ++-
 README.md      |  5 +++++
 compat-25.1.el |  1 -
 compat-27.1.el | 17 ++---------------
 compat-28.1.el | 13 +++++++++----
 compat-help.el | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 compat-macs.el | 13 ++++++++++++-
 compat.el      | 28 +++++++++++++---------------
 8 files changed, 100 insertions(+), 37 deletions(-)
 create mode 100644 compat-help.el