Introduce backwards compatible (broken) realpath function

Move working function to new LVO. Note that declaration was made public
on 22nd August so between then and now there was correct declaration
referring to function at old LVO. There were no SDK release after that
date so the problem was not made public.

Detect AVX2 support, because code is compiled with -mavx2

AVX2 instruction was generated (correct) and was causing boot failure on
IvyBridge CPUs.

Set base version as version 1.

This stops API from being reset to version 0 now that version 2 is set.

Fix: extLowBlock and extHighBlock must be relative to start of EBR

They cannot be assigned from rootLowBlock/rootHighBlock because these
are relative to start of disk. This was causing child partitions
in EBR to get de_LowCyl and de_HighCyl values which are relative to
start of disk, while these must be relative to start of EBR or writes
will happen "after end of disk". Problem visible when there are MBR
partitions covering at least half of disk before EBR partition.

Backport: mingw32 compilation fixes

Update revision for release

Fix bugs in wcsncpy

a) overflow when cnt == 0
b) was bitwise & while needed logic &&

Backport: Allow for up to 5 retries when TX ring is full

Testing on VirtualBox showed that TX ring can sometimes become full between
consecutive requests. This is often happening when entiring YT video page
where Odyssey makes a lot of requests in short amount of time. In such
case give up to 5 iterations of 20ms for the (emulated) card to send the
data before giving up.

Problem is also triggered by opening two shells and doing ping -f <router ip>
in each of them.

TO BE MERGED: Build png.datatype

Backport: Support registering atexit() functions before CrtProgCtx is…

… created

This can happen in C++ when there is a global object which creates a
static object in its constructor. Creation of global object is run in
CTORS set and static object destructor is registered with atexit.

This all happens before __progonly_program_startup had a chance to run
and create CrtProgCtx