Get rid of <unistd.h> include.

* tests/test_file.c (main):
  - Replace unlink() calls with remove() from <stdio.h> and drop
    <unistd.h> include, fixing build issue on Windows.

Addressing Windows build issue differently from what proposed by
@fanc999 in pull request #15. Thanks @fanc999 for first raising this.

Author: thep

ChangeLog

@@ -1,3 +1,14 @@
+2021-01-22  Theppitak Karoonboonyanan  <[email protected]>
+
+	Get rid of <unistd.h> include.
+
+	* tests/test_file.c (main):
+	  - Replace unlink() calls with remove() from <stdio.h> and drop
+	    <unistd.h> include, fixing build issue on Windows.
+
+	Addressing Windows build issue differently from what proposed by
+	@fanc999 in pull request #15. Thanks @fanc999 for first raising this.
+
 2021-01-15  Theppitak Karoonboonyanan  <[email protected]>
 
 	Use TRIE_CHAR_TERM in TAIL I/O methods.

tests/test_file.c

@@ -28,7 +28,6 @@
 #include "utils.h"
 #include <stdio.h>
 #include <wchar.h>
-#include <unistd.h>
 
 #define TRIE_FILENAME "test.tri"
 
@@ -79,7 +78,7 @@ main (void)
 
     /* save & close */
     msg_step ("Saving trie to file");
-    unlink (TRIE_FILENAME);  /* error ignored */
+    remove (TRIE_FILENAME);  /* error ignored */
     if (trie_save (test_trie, TRIE_FILENAME) != 0) {
         printf ("Failed to save trie to file '%s'.\n", TRIE_FILENAME);
         goto err_trie_created;
@@ -116,12 +115,12 @@ main (void)
         goto err_trie_saved;
     }
 
-    unlink (TRIE_FILENAME);
+    remove (TRIE_FILENAME);
     trie_free (test_trie);
     return 0;
 
 err_trie_saved:
-    unlink (TRIE_FILENAME);
+    remove (TRIE_FILENAME);
 err_trie_created:
     trie_free (test_trie);
 err_trie_not_created: