string.h uses restrict

[Reuben Thomas]

string.h uses restrict, which doesn't work if the compiler is C89 (e.g. gcc 
in -std=c89 mode).

regex.h has some code to detect this case and allow for it; should string.h 
copy this code? Or should it be broken out into a module? (It would be 
useful to gnulib users too.)

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