(dumper.exe): Link against psapi.dll.
* cygcheck.cc (_WIN32_WINNT): Define as 0x0602.
(pInternetCloseHandle): Drop pointer.
(PRODUCT_UNLICENSED): Drop definition.
(PRODUCT_PROFESSIONAL_WMC): Ditto.
(package_grep): Delete code loading wininet functions dynamically, just
call functions directly.
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.
