process.c: defaults to close_others false

Arbitrarily closing file descriptors on exec breaks use cases
where a Ruby process sets up a descriptor for non-Ruby children
to use.  For example, the "rake foo" target may spawn any number
of subprocesses (Ruby or not) which depends on parsing the "FOO"
environment variable for out_fd:99 and writing to foo.out

    FOO=out_fd:99 rake foo 99>>foo.out

Unfortunately, this introduced one incompatibility in
test/lib/test/unit.rb and it now requires explicitly setting
IO#close_on_exec=true

[ruby-core:88007] [Misc #14907]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64399 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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