[SHELL] Fixed klibc/klcc build problems

klibc does not have mempcpy, so system.h must be included where this is used
to provide the replacement. glob.h doesn't exist, so we need to guard this
include with the HAVE_GLOB definition. Finally, klcc didn't like the syntax
of the main definition in mksignames, and the resulting program segfaulted
when trying to dereference any part of the argv array. Updating the main
function definition solved the problem.

Signed-off-by: Dan McGee <dpmcgee@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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