libutils: provide empty __getauxval() implementation

Never version of libgcc are built with LSE implementation in mind. To
determine if LSE is available on platform it calls __getauxval(), so in
som

libutils: provide empty __getauxval() implementation

Never version of libgcc are built with LSE implementation in mind. To
determine if LSE is available on platform it calls __getauxval(), so in
some cases we can get undefined reference to __getauxval() error.

Prominent case is libgcc_eh.a library, which is used by C++ TAs. Exception
handler depends on atomic operations, so it tries to call
init_have_lse_atomics() first. This function in turn calls __getauxval(),
which causes linking error.

In the future we can make __getauxval() to return actual platform
capabilities.

Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Jerome Forissier <jerome@forissier.org>

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