Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add static where appropriate.
Sync with some of DragonflyBSD's latest cleanups

Reviewed by: mjg

Remove the advertising clause from UCB copyrighted files in usr.bin. This
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

Also add $FreeBSD$ to a few files to keep svn happy.

Discussed with: imp, rwatson

ANSIify function definitions.
Add some constness to avoid some warnings.
Remove use register keyword.
Deal with missing/unneeded extern/prototypes.
Some minor type changes/casts to avoid warnings.

Reviewed by: md5

Minor cleanup: ANSI C function declarations, use argc after getopt(3) to check
for remaining arguments, rather than checking for *argv being a boolean truth.
Instead of using an empty case to check for -f- to mean "read stdin", and have
stdin reopned otherwise, use a FILE* for the mbox, and assign it to stdin when
we mean to use stdin, otherwise fopen(3). Kill `register' qualifier.

Consistently use FBSDID

remove __P

Replaced unsafe use of sprintf() with snprintf().

optarg and optind are declared in unistd.h.
h_error is declared in netdb.h

$Id$ -> $FreeBSD$

This covers the previous version, since a null commit message was accidentally
used:

Add a -c flag to print a count of messages and exit.

PR: 10921
Submitted by: James Howard <howardjp@byzantine.student.umd.edu>
Requested by: DES

*** empty log message ***

Add usage(), use err(3).

compare return value from getopt against -1 rather than EOF, per the final
posix standard on the topic.

Honor the MAIL environment variable, if set.
Submitted-by: Dan Cross <cross@math.psu.edu>

Read from standard input if file name "-" is given.

This commit was generated by cvs2svn to compensate for changes in r1590,
which included commits to RCS files with non-trunk default branches.

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