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/calls/gettimeofday.c

@@ -38,8 +38,8 @@
  * @param tz is completely ignored
  * @return 0 on success, or -1 w/ errno
  * @raise EFAULT if `tv` points to invalid memory
- * @see	clock_gettime() for nanosecond precision
- * @see	strftime() for string formatting
+ * @see clock_gettime() for nanosecond precision
+ * @see strftime() for string formatting
  * @asyncsignalsafe
  * @vforksafe
  */