stack.c: avoid arithmetic on pointers to voidHEADmaster

In stack.c r1.34 I converted one 'char *' too many to 'void *', thereby
relying on a gcc/clang extension which interprets the fictional void
type as a type of size 1 (that's what the stack code wants, fortunately).
As pointed out in the link below, -Wpointer-arith would have caught this:
https://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html

MSVC flags this as follows:

D:\a\portable\portable\crypto\stack\stack.c(211,23): error C2036: 'const void *': unknown size [D:\a\portable\portable\build\crypto\crypto_obj.vcxproj].

Pull in workaround from the portable repo which undoes the char * -> void *
conversion.

ok jsing millert

0 files changed, 0 insertions, 0 deletions