[PATCH] correct __clear_cache signature

[Martin Sebor]

Recent libgcc builds have been triggering -Wbuiltin-declaration-mismatch
due to the declaration of the __clear_cache built-in being incompatible
with how GCC declares it internally.  The attached patch adjusts
the libgcc declaration and the one in the manual to match what GCC
expects.

Tested on x86_64-linux.

Martin
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