[0.4.8][CRT] Fix 2 MSVC compiler warnings CORE-17812

[0.4.8][CRT] Fix 2 MSVC compiler warnings CORE-17812

observed with MSVC2010SP1 16.0.40219.1 x86-target in dbg+rls-config several times:
sdk\lib\crt\string\wtoi64.c(28) : warning C4146: unary minus operator applied to unsigned type, result still unsigned
sdk\lib\crt\string\wtoi64.c(194) : warning C4146: unary minus operator applied to unsigned type, result still unsigned

the fix is a PARTIAL port of 0.4.15-dev-2951-g 5d8e834897781944dcaf80de6c3df9c2c51212c7

and while touching the file
fix another white-space-glitch.
in sum that brings us 100% in sync in this file to master 0.4.15-dev-3264-g570cedf.