initial top-level import of subdirectories

include/unistd.h

@@ -0,0 +1,9 @@
+#include_next <unistd.h>
+
+#ifndef LIBCRYPTOCOMPAT_UNISTD_H
+#define LIBCRYPTOCOMPAT_UNISTD_H
+
+int getentropy(void *buf, size_t buflen);
+int issetugid(void);
+
+#endif