patch 9.0.1639: build failure without the crypt feature

Problem:    Build failure without the crypt feature.
Solution:   Adjust #ifdefs

src/fileio.c

@@ -218,7 +218,9 @@ readfile(
     int		using_b_ffname;
     int		using_b_fname;
     static char *msg_is_a_directory = N_("is a directory");
+#ifdef FEAT_CRYPT
     int		eof = FALSE;
+#endif
 #ifdef FEAT_SODIUM
     int		may_need_lseek = FALSE;
 #endif
@@ -1276,10 +1278,11 @@ retry:
 				if (!curbuf->b_p_eol)
 				    --tlen;
 				size = tlen;
+#ifdef FEAT_CRYPT
 				eof = TRUE;
+#endif
 				break;
 			    }
-
 			}
 		    }
 		}
@@ -1331,8 +1334,10 @@ retry:
 		    long read_size = size;
 		    size = read_eintr(fd, ptr, read_size);
 		    filesize_count += size;
+#ifdef FEAT_CRYPT
 		    // hit end of file
 		    eof = (size < read_size || filesize_count == filesize_disk);
+#endif
 		}
 
 #ifdef FEAT_CRYPT

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1639,
 /**/
     1638,
 /**/