(dump_sysinfo): Ditto.
* loadlib.h (_load_sys_library): Mark as used, to avoid a compiler
warning.
* path.cc (oopt): Gurad with !FSTAB_ONLY to avoid a compiler warning.
(read_flags): Ditto.
Include throughout files using LoadLibrary function.
* cygcheck.cc (dump_sysinfo): Retrieve kernel32.dll handle via
GetModuleHandle, rather than using LoadLibrary.
* cygpath.cc (get_long_name): Ditto.
(do_sysfolders): Append .dll suffix in LoadLibrary call.
* ldh.cc (WinMain): Use LoadLibraryExW with DONT_RESOLVE_DLL_REFERENCES
to avoid loading malicious library code.
* locale.cc (print_locale_with_codeset): Change way to retrieve
kernel32.dll path.
