Xcode 10 build failure

[tburgin]

santa-driver_info.c used to be generated by xcodebuild at the begging of the run. This allowed us to edit the version string literal. Xcode 10 now generates the file right before compiling it.
Our script to edit the version fails with:

santa-driver_info.c: No such file or directory
Command PhaseScriptExecution failed with a nonzero exit code

A work around is to write the file to disk at the location xcodebuild expects.

#include <mach/mach_types.h>

extern kern_return_t _start(kmod_info_t *ki, void *data);
extern kern_return_t _stop(kmod_info_t *ki, void *data);

__attribute__((visibility("default"))) KMOD_EXPLICIT_DECL(com.google.santa-driver, "0.9.30", _start, _stop)
__private_extern__ kmod_start_func_t *_realmain = 0;
__private_extern__ kmod_stop_func_t *_antimain = 0;
__private_extern__ int _kext_apple_cc = __APPLE_CC__ ;

This workaround will likely be the only solution until #303

[russellhancox]

Obsolete now we use bazel.