[wp-trac] [WordPress Trac] #49485: Make Travis CI builds pass for all supported branches

[WordPress Trac]

#49485: Make Travis CI builds pass for all supported branches
------------------------------+-----------------------------
 Reporter:  SergeyBiryukov    |       Owner:  SergeyBiryukov
     Type:  task (blessed)    |      Status:  accepted
 Priority:  normal            |   Milestone:  Future Release
Component:  Build/Test Tools  |     Version:
 Severity:  normal            |  Resolution:
 Keywords:                    |     Focuses:
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Comment (by SergeyBiryukov):

 In [changeset:"47333" 47333]:
 {{{
 #!CommitTicketReference repository="" revision="47333"
 Build/Test Tools: Improve Travis CI configuration for better performance
 on 3.9 branch.

 This backports [28799] and [28873].

 See #49485.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/49485#comment:6>
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