fix(ffi): use function pointer type for x86_64 objc_msgSend target

[skrtdev]

Fixes #47

Problem

On Xcode 26, x86_64 simulator builds fail when compiling NativeApiJsiInvocation.h:

error: cannot initialize a variable of type 'void *' with an rvalue of type 'void (*)()'
error: no matching function for call to 'ffi_call'

Solution

In the __x86_64__ stret dispatch path, change the target variable from void* to void (*)(void) so it matches ffi_call's second parameter and the FFI_FN() macro return type.

The arm64 branch already passes FFI_FN(...) directly; this aligns the x86_64 branch with the same typing without changing runtime behavior.

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Pull request overview

Fixes x86_64 iOS simulator builds on Xcode 26 by aligning the Objective-C objc_msgSend dispatch target type with libffi’s ffi_call function-pointer parameter.

Changes:

• In the __x86_64__ stret dispatch path, changes target from void* to void (*)(void) so it can be passed to ffi_call without an invalid conversion.
• Keeps arm64/non-x86_64 behavior unchanged while making x86_64 consistent with the existing FFI_FN(...) usage.

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