Flush and close file descriptor after write when extracting a file node;

Remove #include directives automatically added by editor which only
exist on Linux;

haggis.c

@@ -32,12 +32,10 @@
 
 #include "haggis.h"
 #include "mq.h"
-#include <asm-generic/errno-base.h>
 #include <assert.h>
 #include <errno.h>
 #include <libgen.h>
 #include <limits.h>          // PATH_MAX
-#include <linux/limits.h>
 #include <stddef.h>
 #include <stdint.h>          // uint<x>_t
 #include <sys/unistd.h>
@@ -846,6 +844,8 @@ int haggis_extract_file(haggis_node *node, char *basedir) {
     if (ret != len) {
         return 2;
     }
+    fflush(fd);
+    fclose(fd);
     free(path);
     return 0;
 }