Update Solution.pm for new LoongArch CRC symbol

Oversight in 4d14ccd, per report from Amit Kapila
and Michael Paquier.

Discussion: https://postgr.es/m/CAA4eK1LsV3KuyUt8tzZDjPcUds1XfVVeW3Wpeju_59DtRV0%3DxQ%40mail.gmail.com

Author: j-naylor

src/tools/msvc/Solution.pm

@@ -432,6 +432,7 @@ sub GenerateFiles
 		USE_LZ4 => undef,
 		USE_LDAP => $self->{options}->{ldap} ? 1 : undef,
 		USE_LLVM => undef,
+		USE_LOONGARCH_CRC32C => undef,
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL => undef,
 		USE_PAM => undef,