samples: add arm-cortexa5-linux-uclibcgnueabihf

This configuration has been tested on an Atmel sama5d3 board. It is a Cortex-A5
without neon and the floating point unit is a vfpv4-d16.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Add main EXPERIMENTAL_PATCHES setting

This change adds support for experimental patches to be introduced to
crosstool-ng. The patches enabled by this option are to be located here:

    patches/experimental/<package>/<version>/XXXX-NAME.patch

Where, XXXX is the patch number to be applied in order, like:
    0001-some_patch_one.patch
    0002-some_patch_two.patch
    9999-some_patch_to_be_applied_last.patch

In the first patch series, all patches in the EXPERIMENTAL_PATCHES
option will be applied all at once, or none at all.

In a later [RFC] patch, I plan on adding finer tuned patch
enable/disable options based on the name of the patch and where it is
located in the patches/experimental sub-tree. So the name of the patch
should use underscores between words in the patch name.

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>
[yann.morin.1998@free.fr: slightly reword prompt]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>