map and for-each in scheme

* module/ice-9/boot-9.scm (map, for-each): Implement in Scheme instead
  of C.  There are boot versions before `cond' is defined.
  (map-in-order): Define this alias here instead of in evalext.h.

* libguile/eval.c: Stub out the map and for-each definitions to just
  call into Scheme.

* libguile/evalext.c: Remove map-in-order definition.

* module/srfi/srfi-1.scm: Replace all calls to map1 with calls to map.
  (map, for-each): Define implementations here, in Scheme, instead of in
  C.

* test-suite/tests/eval.test (exception:wrong-length, "map"): Update the
  expected exception for mapping over lists of different lengths.

* libguile/srfi-1.h:
* libguile/srfi-1.c: Remove map and for-each definitions.  Remove the
  bit that extended the core `map' primitive with another method: the
  right way to do that is with modules.

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