[0.4.10][HOST-TOOLS:MKSHELLLINK] Fix 8 MSVC2010SP1 x86 dbg warnings C4018 CORE-18104

[0.4.10][HOST-TOOLS:MKSHELLLINK] Fix 8 MSVC2010SP1 x86 dbg warnings C4018 CORE-18104

From releases/0.4.9 to releases/0.4.10 we introduced tons of compiler warnings
within the whole host-tools component although the 'offending' code did not change in between both.
I am not aware which commit unhid them exactly during 0.4.10-dev',
but I will follow the footsteps of master with the fixes.
releases/0.4.9 still had 0 warnings within host-tools!

warnings can be observed with MSVC 2010SP1 (16.0.40219.1) x86 target in dbg configuration:
[6/12736] Performing build step for 'host-tools'
C:\0410rls\reactos\sdk\tools\mkshelllink\mkshelllink.c(147) : warning C4018: '<' : signed/unsigned mismatch
C:\0410rls\reactos\sdk\tools\mkshelllink\mkshelllink.c(153) : warning C4018: '<' : signed/unsigned mismatch
C:\0410rls\reactos\sdk\tools\mkshelllink\mkshelllink.c(155) : warning C4018: '<' : signed/unsigned mismatch
C:\0410rls\reactos\sdk\tools\mkshelllink\mkshelllink.c(157) : warning C4018: '<' : signed/unsigned mismatch
C:\0410rls\reactos\sdk\tools\mkshelllink\mkshelllink.c(159) : warning C4018: '<' : signed/unsigned mismatch
C:\0410rls\reactos\sdk\tools\mkshelllink\mkshelllink.c(161) : warning C4018: '<' : signed/unsigned mismatch
C:\0410rls\reactos\sdk\tools\mkshelllink\mkshelllink.c(164) : warning C4018: '<' : signed/unsigned mismatch
C:\0410rls\reactos\sdk\tools\mkshelllink\mkshelllink.c(169) : warning C4018: '<' : signed/unsigned mismatch

partial pick from: 0.4.13-dev-132-g f47f45dbdd68e21ec7ab283877cbd139f418c804