Bump Emacs version to 26.1.90

* README:
* configure.ac:
* msdos/sed2v2.inp:
* nt/README.W32: Bump Emacs version to 26.1.90.
1 job for emacs-26
Status Job ID Name Coverage
  Test
failed #49
test

 
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failed
test Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
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