toolchain-external: add a check for unsupported toolchains

toolchain-external: add a check for unsupported toolchains

Some toolchain can't be used by Buildroot due to sysroot location
issue, so the $(ARCH)-linux-gnu-gcc -print-file-name=libc.a command
return only "libc.a"

This lead to an error during the header check version helper,
so these toolchains can't be imported into Buildroot.

cc1: fatal error: $PWD/libc.a/usr/include/linux/version.h: No such file or directory
compilation terminated.
support/scripts/check-kernel-headers.sh: line 38: /tmp/check-headers.4V5PPF: Permission denied

This issue happen with the first linaro 2015.11 [1] release and
CodeSourcery standard edition [2].

Here is the sysroot directory tree for linaro 2015.11:
$ ls libc/arm-linux-gnueabihf
etc  lib  sbin  usr  var

Here is the sysroot directory tree for CodeSourcery standard:
$ ls libc/sgxx-glibc
etc  lib  lib64  sbin  usr  var

Add a check to error out with an explicit error message

The check don't use toolchain_find_libc_a function directly since
"realpath -f" is used internally and return an absolute path.

[1] https://bugs.linaro.org/show_bug.cgi?id=1995#c7
[2] http://lists.busybox.net/pipermail/buildroot/2014-October/110696.html

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>