Use a fixed date in pcsc-spy.1 manpage

The manpage pcsc-spy.1 is generated by pod2an from pcsc-spy.pod. The
date included in the manpage is the current date of generation.
This caused problems when installing libpcsclite-dev for 2 different
architectures at the same time.

Thanks to Francois Gouget for the bug report
"Bug#1064636: libpcsclite-dev: The i386 libpcsclite-dev 2.0.1-1+b1 package conflicts with the amd64 one"
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1064636

src/spy/Makefile.am

@@ -14,6 +14,7 @@ pcsc-spy.1: pcsc-spy.pod
 	pod2man \
 		--center="PC/SC lite" \
 		--release="$(PACKAGE_NAME) $(PACKAGE_VERSION)" \
+		--date=2024-01-01 \
 		$(srcdir)/pcsc-spy.pod > $@
 endif