MFC	r267875:

4251 libdtrace leaks open file handles

Illumos commit:		93ed8d0d4b068b95d0bb50d57bb854df462a8485
			(partial)
Reference:
https://www.illumos.org/issues/4251

Discussed with:	Robert Mustacchi
Obtained from:	Illumos
MFC	r269015:
fparseln(3): Update from NetBSD sources.

-fix a condition so that fparseln() doesn't report spurious empty lines
 eg after 2 comment lines, or on EOF after a single comment line
-no escape character means no escaped characters

modify the previous fix so that no pointless realloc()s are done in
the case of multiple empty continuation lines, and comment the code
to make the logics obvious.

fparseln is now part of libc in NetBSD so this changes the previous
revision numbering.

Obtained from:	NetBSD (CVS Rev. 1.6-1.7)
MFC	r269695:
Const-ify character string

Obtained from:  Apple Inc. (Libc 997.90.3)
MFC after:	3 days
MFC	r269901:
Minor style tweaks.

Obtained from:	OpenBSD (CVS rev. 1.7)
MFC	r269953:
Use "NO NAME" as the default unnamed label.

Microsoft recommends avoiding the use of spaces in the
string structures for FAT. Unfortunately they do just
that by default in the case of unlabeled filesystems.

Follow the default MS behavior to avoid confusion in
common tools like file(1). This was actually the
default behavior before r203868.

Obtained from:	NetBSD (CVS rev. 1.39)