more modeline errata (#1019)

Somehow or another, I previously had missed `BUILD.mk` files.

In the process I found a few straggler cases where the modeline was
different from the file, including one very involved manual fix where a
file had been treated like it was ts=2 and ts=8 on separate occasions.

The commit history in the PR shows the gory details; the BUILD.mk was
automated, everything else was mostly manual.

libc/stdio/BUILD.mk

@@ -1,5 +1,5 @@
 #-*-mode:makefile-gmake;indent-tabs-mode:t;tab-width:8;coding:utf-8-*-┐
-#── vi: set et ft=make ts=8 sw=8 fenc=utf-8 :vi ──────────────────────┘
+#── vi: set noet ft=make ts=8 sw=8 fenc=utf-8 :vi ────────────────────┘
 
 PKGS += LIBC_STDIO
 

libc/stdio/clearerr.c

@@ -22,7 +22,7 @@
  * Clears eof and error state indicators on stream.
  *
  * @param f is file object stream pointer
- * @see	clearerr_unlocked()
+ * @see clearerr_unlocked()
  */
 void clearerr(FILE *f) {
   flockfile(f);

libc/stdio/clearerr_unlocked.c

@@ -23,7 +23,7 @@
  * Clears eof and error state indicators on stream.
  *
  * @param f is file object stream pointer
- * @see	clearerr()
+ * @see clearerr()
  */
 void clearerr_unlocked(FILE *f) {
   f->state = 0;

libc/stdio/feof.c

@@ -22,7 +22,7 @@
  * Returns true if stream is in end-of-file state.
  *
  * @param f is file object stream pointer
- * @see	feof_unlocked()
+ * @see feof_unlocked()
  */
 int feof(FILE *f) {
   int rc;

libc/stdio/feof_unlocked.c

@@ -23,7 +23,7 @@
  * Returns true if stream is in end-of-file state.
  *
  * @param f is file object stream pointer
- * @see	feof()
+ * @see feof()
  */
 int feof_unlocked(FILE *f) {
   return f->state == -1;

libc/stdio/iconv.c

@@ -1,5 +1,5 @@
 /*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
-│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8                               :vi │
+│ vi: set noet ft=c ts=2 sts=2 sw=2 fenc=utf-8                             :vi │
 ╚──────────────────────────────────────────────────────────────────────────────╝
 │                                                                              │
 │  Musl Libc                                                                   │