scripts: git download tool should use dwl-url variable
Merge branch 'master' of https://github.com/mchalain/makeroot
Merge branch 'master' of https://github.com/mchalain/makeroot
Merge branch 'master' of https://github.com/mchalain/makeroot
Merge branch 'master' of https://github.com/mchalain/makeroot
bootloader : set u-boot default version
tools: remove generated files to the repository
scripts: force symbolic link creation during installation
libc: header files installation

install "sys" header file from usr/include/$(cross_compile)/sys
kernel: change config name

change LINUX_CUSTOM* to KERNEL_CUSTOM*.
by default the kernel is Linux but we can image to use an other one
scripts: subprojects build rules

the rules depends from the package directory.
After the INSTALL step of the package, a file appears inside the package
directory.
During the recipes of subproject if this .post-install file exists, the
recipes do the post-install step and remove the file.
scripts: tools was twice in one case
scripts: force installation of all packages

make install executes the post-install of all packages which are already
built, and install files.
scripts: force-install for subdir