Fix compilation errors when compiling on iOS

[FireMario211]

Currently when compiling TulipHook with iOS, it fails to compile as importing anything related to mach_vm.h is unsupported.

error: mach_vm.h unsupported

While this can easily be bypassed by simply removing the definition in the header file, adding an #ifdef to check if the target is currently running on iOS and using alternatives to mach (like instead of mach_vm_allocate, use vm_allocate) should fix this issue. Same with types.

Otherwise, the DarwinTarget.cpp file may need to have new code written for when iOS is the target.