#1698: Use 0666 as the default file mode in "file-open" from the chicken.file.posix module

[Chicken Trac]

#1698: Use 0666 as the default file mode in "file-open" from the
chicken.file.posix module
--------------------------------+----------------------------
            Reporter:  evhan    |       Type:  change request
              Status:  new      |   Priority:  minor
           Milestone:  someday  |  Component:  core libraries
             Version:  5.2.0    |   Keywords:
Estimated difficulty:  trivial  |
--------------------------------+----------------------------
 Currently, using `file-open` without the optional mode argument which
 otherwise defaults to 0744 in posixunix.scm.  This is inconsistent with
 the behavior of other procedures such as `open-output-file` (0644). We
 should rather use 0666 as the default mode to align with the procedures
 that create files with fopen(3).

 From: https://lists.nongnu.org/archive/html/chicken-
 hackers/2020-05/msg00021.html

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Ticket URL: <https://bugs.call-cc.org/ticket/1698>
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