[patch] fix minor warning in funcs.c

[Mike Frysinger]

when i was playing around with the code earlier, i noticed a minor warning in 
funcs.c about implicit definition of iswprint() ... simple patch attached to 
include wctype.h when available and thus get access to the prototype

side note ... configure.ac currently calls AC_CHECK_HEADERS() multiple 
times ... all the calls could be condensed into one ... doing so shaves like 
47k off of configure :)
-mike
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