long overdue header cleanup

buffer/buffer_init_read_allocbuf.c

@@ -1,5 +1,5 @@
 #include <unistd.h>
-#include "buffer.h"
+#include <libowfat/buffer.h>
 
 int buffer_init_read_allocbuf(buffer* b, int fd, size_t ylen) {
   return buffer_init_allocbuf(b, read, fd, ylen);