documentation: Remove refs to seemingly native toolchains issue

Remove references to the seemingly native toolchains do not build
issue as it seems to be fixed.

Signed-off-by: Richard Strand <richard.strand@icomera.com>

1.5: update version string to 1.5.3+hg

Tagging release 1.5.3

i1.5: update version string to 1.5.3

libc/uClibc: add patch to fix IP frames on BE targets

Pack netinet structs to be possible to use for creating
IP frames on big-endian targets.

Signed-off-by: Joachim Nilsson <jocke@vmlinux.org>
[yann.morin.1998@anciens.enib.fr: removed getline patch, already in]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
(transplanted from 5c246abe7716271c0ce31d980d92eb9a304995c8)

libc/uClibc: do not mangle ARM {E,O}ABI when ARCH != ARM

(manualy transplanted from 2ad2cbc1f709f48a195746476a71f1244cc67cee)
(transplanted from 2ad2cbc1f709f48a195746476a71f1244cc67cee))

debug/tools: set the ncurses extension to .tar.gz

TRying to download every extension in turn takes ages, so
help the helper by telling what extension to retrieve.
(transplanted from 08b0982e4da9402ad39fde431353ebf0248ea34c)

config: fix generated config files when GREP_OPTIONS set --color=always

grep is used when generating some .in files (in config.gen). If GREP_OPTIONS
contains --color=always, then the generated files will contains some escape
sequences setting the color, and mconf would choke on those escape sequences.

Always set and export an empty GREP_OPTIONS to avoid that.

Issue reported by Kevin Kirkup <kevin dot kirkup at gmail dot com> :
http://sourceware.org/ml/crossgcc/2009-12/msg00026.html
(transplanted from a5020a1facffc046d23d39a71a1b8089ca84beac)

scripts: check for, and warn about an unset CT_PREFIX_DIR

The user shall provide a directory to install the toolchain into.
If he/she does not, this is an error, and shall be detected properly,
rather than relying on failure down the road.

Thanks to "Pedro I. Sanchez" <psanchez@colcan.ca> for pointing out
the issue:
http://sourceware.org/ml/crossgcc/2009-12/msg00011.html
(transplanted from e94f4ffddd1d07b3841160db71694cd19fda6b03)

debug/gdb: Add support for GDB 7.0.1 (minor release)

Signed-off-by: Joachim Nilsson <jocke@vmlinux.org>