Contribs: fix gcrypt git init for reconf

contrib/src/gcrypt/rules.mak

@@ -69,7 +69,8 @@ endif
 .gcrypt: gcrypt
 	# Reconfiguring this requires a git repo to be available, to
 	# successfully produce a nonempty mym4_revision_dec.
-	git init && git commit --allow-empty -m "dummy commit"
+	git init && git config --local user.email "cone@example.com" && git config --local user.name "Cony Cone" && \
+		git commit --allow-empty -m "dummy commit"
 	$(RECONF)
 	cd $< && $(HOSTVARS) CFLAGS="$(CFLAGS) $(GCRYPT_EXTRA_CFLAGS)" ./configure $(HOSTCONF) $(GCRYPT_CONF)
 	cd $< && $(MAKE) install