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/intrin/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_INTRIN
 

libc/intrin/kpollnames.S

@@ -31,7 +31,7 @@
 	.balign	4
 	.underrun
 kPollNames:
-        .e	POLLNVAL	"POLLNVAL"
+	.e	POLLNVAL	"POLLNVAL"
 	.e	POLLWRNORM	"POLLWRNORM"
 	.e	POLLWRBAND	"POLLWRBAND"
 	.e	POLLRDNORM	"POLLRDNORM"

libc/intrin/kstarttsc.c

@@ -20,7 +20,7 @@
 /**
  * Timestamp of process start.
  *
- * @see	libc/runtime/winmain.greg.h
- * @see	libc/crt/crt.S
+ * @see libc/runtime/winmain.greg.h
+ * @see libc/crt/crt.S
  */
 uint64_t kStartTsc;