Remove placeholder config variables.
/* #define JANET_NO_DOCSTRINGS */
/* #define JANET_NO_SOURCEMAPS */
/* #define JANET_REDUCED_OS */
-/* #define JANET_OS_NO_EXECUTE */
-/* #define JANET_OS_NO_TIME */
-/* #define JANET_OS_NO_FS */
-/* #define JANET_OS_NO_ENV */
/* Other settings */
/* #define JANET_NO_ASSEMBLER */
