test-suite: Added new test suite feature (experimental)

This patch adds support for installing the gcc test suite. A helper
Makefile is provided for building and running the gcc tests.

The default configuration runs all gcc tests and requires automatic
ssh/scp login access to a networked target board. See README for
more details.

Note: Current feature is tested with the powerpc-unknown-linux-gnu
sample but it should work with others as well.

Signed-off-by: Martin Lund <mgl@doredevelopment.dk>

# Configuration file for sstrip tool facility

# depends on ! BACKEND

comment "sstrip"

    depends on ARCH_BINFMT_ELF

config SSTRIP

    bool

    prompt "sstrip"

    depends on ARCH_BINFMT_ELF

    help

      The sstrip utility, to maximise the striping of ELF binaries

      (executables and libraries).

      Buildroot version, forked off the original from ELFkickers.  This one

      is somewhat maintained by the buildroot guys.   

      Supports big-endian systems.