Bug 201903

In macOS 10.15 and iOS 13.0 SDKs, the keyPackage parameter of CCECCryptorImportKey() was changed from "void*" to "const void*". This change was accounted for in Bug 195754 by making the same change to the parallel declarations in CommonCryptoSPI.h. But since this header also needed to be used in macOS 10.14 contexts, the old declaration was also kept. But since this function is a "C" function, the types of parameters are not included in the function signature, and it doesn't really matter what parameter types are, so long as the right values are sent to the called function. This means that we don't need two versions of the function, one with a "const" parameter and one without. We only really need one. In this case, it makes sense to keep the more-restrictive one -- the with a "const void*" parameter. Therefore, remove the one taking just "void*".