Update solution dependencies: 'host' and 'nslookup' depend on libirs.

See https://gitlab.isc.org/isc-projects/bind9/-/jobs/411425

82>Link: C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\bin\HostX86\x64\link.exe /ERRORREPORT:QUEUE /OUT:"......\Build\Release\host.exe" /INCREMENTAL:NO /NOLOGO /LIBPATH:Release /LIBPATH:......\lib\isc\win32\Release /LIBPATH:......\lib\isccfg\win32\Release /LIBPATH:......\lib\irs\win32\Release /LIBPATH:......\lib\dns\win32\Release /LIBPATH:......\lib\bind9\win32\Release C:\OpenSSL\libcrypto.lib dighost.lib libisc.lib libisccfg.lib libirs.lib libdns.lib libbind9.lib ws2_32.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /MANIFEST /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /manifest:embed /PDB:"......\Build\Release\host.pdb" /SUBSYSTEM:CONSOLE /OPT:REF /OPT:ICF /TLBID:1 /DYNAMICBASE /NXCOMPAT /IMPLIB:"......\Build\Release\host.lib" /MACHINE:X64 .\Release\host.obj 82>LINK : fatal error LNK1181: cannot open input file 'libirs.lib' [C:\builds\isc-projects\bind9\bin\dig\win32\host.vcxproj]