Enable Halide::Internal::running_program_name() on Apple
Enable Halide::Internal::running_program_name() on Apple

Uses `_NSGetExecutablePath()` from `mach-o/dyld.h` and preprocessor conditionals

Uppercased macro name

Typography is our first line of defense – and often our _only_ line of defense – against chaos


Former-commit-id: 417681f594ebac778e805b46cc7f0561f36a3fa9
darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide