It's supposed to be void*. The only reason this was working was that it was
only called in C which happily casts from void* to T*. (But if called in C++ in
a macro, it breaks.)
Change-Id: I7f765c3572b9b4815ae58da852be1e742de1bd96
Reviewed-on: https://boringssl-review.googlesource.com/5760
Reviewed-by: Adam Langley <agl@google.com>
Initial fork from f2d678e6e89b6508147086610e985d4e8416e867 (1.0.2 beta).
(This change contains substantial changes from the original and
effectively starts a new history.)