#1777: Drop builtin-features from eval.scm

[Chicken Trac]

#1777: Drop builtin-features from eval.scm
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            Reporter:  sjamaan  |       Type:  defect
              Status:  new      |   Priority:  major
           Milestone:  5.4      |  Component:  core libraries
             Version:  5.2.0    |   Keywords:
Estimated difficulty:  easy     |
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 This seems like it's a hack from ye olden days when we didn't have a
 module system yet, and for example `(require srfi-30)` would otherwise try
 to attempt loading a unit library named srfi-30.

 This is confusing and a bit weird, and also there's `##sys#features` which
 might run out of sync with this features list.

 To make this change, the srfi module registrations should be changed to be
 as part of the `library` unit. For example by changing `register-
 primitive-module` to use `#f` or `'library` as the module library name.

 NOTE: Check what the situation with `chicken.csi` and `chicken.foreign` is
 - can they also use `#f` or `'library`?

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Ticket URL: <https://bugs.call-cc.org/ticket/1777>
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CHICKEN Scheme is a compiler for the Scheme programming language.