DON'T MERGE: lmbench - use ARC's version

As it is said here https://github.com/foss-for-synopsys-dwc-arc-processors/lmbench/wiki/LMBench-for-ARC-Linux

 * The only change to source (src/memsize.c) is for increasing a timer
thresh-hold which otherwise makes test harness "memsize" timeout early on our
crawling 80MHz FPGA platform.

All the other tweaks are cosmetic:
 * scripts/config-run-arc: "prompt-less" version of config-run, with default
answers set for everything
 * scripts/results: appending contextual information to raw report generated
viz. kernel {.config,dmesg}, Busybox linkage (static/dynamic)

Also now entire lmbench folder gets installed on target.
This is required to have a complete test harness on board with scripts.
Otherwise only separate tests are available without any automotion for batch
execution.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
DON'T MERGE: Add config for AXS103 without FPU
DON'T MERGE: uclibc - respect top-level CFLAGS