Windows: fix build issue with newer version of Rust #2409

Job	Run time
check (libclamav, (iana_cctld\|bytecode_api_\|bytecode_hooks\|rijndael\|yara\|inffixed\|inflate\|queue\|n...	9s
check (libfreshclam)	9s
check (clamav-milter)	13s
check (clambc)	13s
check (clamconf)	9s
check (clamd)	9s
check (clamdscan)	9s
check (clamdtop)	10s
check (clamonacc, (c-thread-pool\|fts\|priv_fts))	11s
check (clamscan)	11s
check (clamsubmit)	13s
check (freshclam)	10s
check (libfreshclam)	15s
check (common)	11s
check (sigtool)	10s
check (examples)	10s
check (win32/compat)	12s
	3m 4s

Provide feedback