[plt-scheme] Implicit declaration problem

Hi all,

I work on rpm packages of drscheme for openSUSE's new Contrib repository. Our 
build system noticed me about some problems in source code with implicit 
declaration of functions from string.h.

Attached patch includes string.h on systems compiled using gcc. I don't know 
if the big test of existence of SYSV, SVR4 and VMS symbols I have found in 
some files (like char.c) is necessary nowadays, but I didn't remove it and 
used it in all files.

Best Regards
Michal Vyskocil
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