unix windows: mingw32 doesn't have realpath(), use _fullpath() instead.

unix/main.c

@@ -394,7 +394,11 @@ int main(int argc, char **argv) {
                 return usage(argv);
             }
         } else {
+#ifdef __MINGW32__
+            char *basedir = _fullpath(NULL, argv[a], _MAX_PATH);
+#else
             char *basedir = realpath(argv[a], NULL);
+#endif
             if (basedir == NULL) {
                 fprintf(stderr, "%s: can't open file '%s': [Errno %d] ", argv[0], argv[1], errno);
                 perror("");