bash : update PS1 variable
busybox : update PS1 variable
bash: Enable /etc/bash.bashrc
busybox: Use bash.bashrc in profile.d/system.sh
busybox: Add /etc/shells file
busybox: Derive keyboard map from language setting in locale.conf
bash/busybox: Bump revision
pvr: Use flavoured unit files (sifbox vs. common)
vdr-streamdev: Remove duplicate package
Merge branch 'master' into devel

Conflicts:
	packages/system/bash/build
	packages/system/bash/install
	packages/system/busybox/meta
	packages/system/busybox/profile.d/system.sh
functions : force build in build/build.host if PKG_NO_ARCH is set to yes
add new host-packages :
- internal-gmp
- internal-m4
- internal-mpc
- internal-mpfr

this packages are needed to build host-gcc (added too in this commit)

All this packages are built in build/build.host
ccache : use host-gcc