add autotools nativesdk to meta-toolchain

From: Wenzong Fan <[email protected]>

v2 updates:
1) Extend m4 recipe with 'BBCLASSEXTEND="nativesdk"' instead of add new *-nativesdk.bb files;

2) Add more comments to the commit messages.

[yocto #1603]

Add automake-nativesdk and autoconf-nativesdk into meta-toolchain to help users process any new libtool m4 macros in their projects, such as fix the configure issue:

    WARNING: unrecognized options: --with-libtool-sysroot

Also add m4-nativesdk and gnu-config-nativesdk which required by autoconf-nativesdk.

The following changes since commit cf02474bda67f4f1043b2e95e1b371b2354585a7:
Richard Purdie (1):
qt-mobility: Add missing patch

are available in the git repository at:

git://git.pokylinux.org/poky-contrib wenzong/1603
http://git.pokylinux.org/cgit.cgi/poky-contrib/log/?h=wenzong/1603

Wenzong Fan (5):
gnu-config: Extend to provide nativesdk recipe
m4: Extend to provide nativesdk recipe
automake: Extend to provide nativesdk recipe
autoconf: Extend to provide nativesdk recipe
task-sdk-host-nativesdk: add autotools nativesdk to meta-toolchain

 meta/recipes-core/tasks/task-sdk-host-nativesdk.bb |    4 +++-
 meta/recipes-devtools/autoconf/autoconf_2.68.bb    |    9 ++++++---
 meta/recipes-devtools/automake/automake.inc        |    2 +-
 meta/recipes-devtools/automake/automake_1.11.1.bb  |    3 ++-
 .../gnu-config/gnu-config_20111111.bb              |    4 ++--
 meta/recipes-devtools/m4/m4_1.4.16.bb              |    4 +++-
 meta/recipes-devtools/m4/m4_1.4.9.bb               |    4 +++-
 7 files changed, 20 insertions(+), 10 deletions(-)