Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

i18n: csmapper: hook up the top-level .src files to the build

The top-level charset.pivot.src may be empty, but the top-level
mapper.dir.src is not -- it contains some definitions for supplementary
UCS planes. The SMP/SSP definitions aren't actually used at the moment,
but the inclusion of the SIP definitions fixes conversions involving
JISX0213-1/JISX0213-2 to be possible.

Sponsored by: Klara, Inc.

DIRDEPS_BUILD: Fix mapper files building during dirdeps.

Sponsored by: EMC / Isilon Storage Division

Remove realall references from initial NetBSD import in r219019.

We've never had a realall.

Sponsored by: EMC / Isilon Storage Division

Add more SUBDIR_PARALLEL.

MFC after: 3 weeks
Sponsored by: EMC / Isilon Storage Division

share/i18n: Fix installworld with read-only obj.

Since iconv was enabled (r254273, August 13), it has been impossible to
installworld using a read-only obj tree. This is common with NFS. Parts of
share/i18n unconditionally rebuild files like mapper.dir during
installation.

This patch ensures the files like mapper.dir are not rewritten with the same
contents.

Tested by: joel
Approved by: re (hrs)

Don't depend on the touch binary being present.

We can simply create an empty file by doing a no-op and redirecting stdout.

Add the BSD-licensed Citrus iconv to the base system with default off
setting. It can be built by setting the WITH_ICONV knob. While this
knob is unset, the library part, the binaries, the header file and
the metadata files will not be built or installed so it makes no impact
on the system if left turned off.

This work is based on the iconv implementation in NetBSD but a great
number of improvements and feature additions have been included:

- Some utilities have been added. There is a conversion table generator,
which can compare conversion tables to reference data generated by
GNU libiconv. This helps ensuring conversion compatibility.
- UTF-16 surrogate support and some endianness issues have been fixed.
- The rather chaotic Makefiles to build metadata have been refactored
and cleaned up, now it is easy to read and it is also easier to add
support for new encodings.
- A bunch of new encodings and encoding aliases have been added.
- Support for 1->2, 1->3 and 1->4 mappings, which is needed for
transliterating with flying accents as GNU does, like "u.
- Lots of warnings have been fixed, the major part of the code is
now WARNS=6 clean.
- New section 1 and section 5 manual pages have been added.
- Some GNU-specific calls have been implemented:
iconvlist(), iconvctl(), iconv_canonicalize(), iconv_open_into()
- Support for GNU's //IGNORE suffix has been added.
- The "-" argument for stdin is now recognized in iconv(1) as per POSIX.
- The Big5 conversion module has been fixed.
- The iconv.h header files is supposed to be compatible with the
GNU version, i.e. sources should build with base iconv.h and
GNU libiconv. It also includes a macro magic to deal with the
char ** and const char ** incompatibility.
- GNU compatibility: "" or "char" means the current local
encoding in use
- Various cleanups and style(9) fixes.

Approved by: delphij (mentor)
Obtained from: The NetBSD Project
Sponsored by: Google Summer of Code 2009