[dev-serveez] required guile version

[stefan]

Hello,

while trying to link serveez against an installed guile 1.3.4 I had to
notice that the following symbols are version 1.4 compliant only:

SCM_ASSERT_TYPE
scm_simple_format
scm_out_of_range_pos
scm_wrong_type_arg_msg

I am now not sure how to replace these (is it easily possible ?). The
other alternative would be to require 1.4 or later...

Cheers,
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