KWSys: Address Intel compiler remarks

CommandLineArguments.cxx:
 remark #181: argument is incompatible with corresponding format
  string conversion

SystemInformation.cxx:
 remark #193: zero used for undefined preprocessing identifier "_WIN32"
 warning #177: variable "Regebx" was declared but never referenced

SystemTools.cxx(375):
 remark #444: destructor for base class "std::vector<char*>" is not virtual
  class kwsysDeletingCharVector : private kwsys_stl::vector<char*>

Author: Hans Johnson <hans-johnson@uiowa.edu>
Change-Id: Ibc899c3ba14990158ef7bbabace4b435b22495c3