- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Attempt to deal with a compile failure that shows up with gcc, which
has -Werror on. Without this, yylex() is inconsistently or redundantly
defined.

Prevent shadowing.

The name line_number seems to be used as a function parameter name for
one of the Lex functions. Change the name to linenumber.

Let iconv build on -HEAD properly.

- Add NO_WMISSING_VARIABLE_DECLARATIONS where we use Yacc/Lex.
- Add variable declarations where possible.
- Add missing static keyword.

Ensure mkcsmapper and mkesdb compile with clang, if WITH_ICONV is
defined.

Submitted by: zeising
PR: bin/167481
MFC after: 3 days
X-MFC-With: r238197

Fix spelling

PR: bin/167480
Submitted by: zeising
Approved by: cperciva

Unbreak building WITH_ICONV=yes and new yacc.

- Remove a GCC-specific compiler flag that was added before to eliminate
some warnings but at the moment does not seem to be necessary.

Submitted by: arundel (via private mail)
Tested by: arundel
MFC after: 1 week

[mdoc] Fixed .Dt call.

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