Added step in makefile to make the i2pd executable belong to the _i2pd user and group

Makefile

@@ -37,6 +37,12 @@ install:
 		chown -R _i2pd:_i2pd /var/lib/i2pd; \
 	fi
 
+# These commands make the i2pd executable belong to the _i2pd user and
+# group, and make it non-writable for all and non-executable for others.
+	@echo "Giving ownership of i2pd to _i2pd"
+	@chown _i2pd:_i2pd $$(which i2pd)
+	@chmod 550 $$(which i2pd)
+
 # This command copies the RC script in the RC script folder to allow I2Pd to
 # be managed by the service supervisor.
 	@echo "Installing i2pd service"
@@ -50,6 +56,11 @@ uninstall:
 	@rcctl disable i2pd
 	@rm -f /etc/rc.d/i2pd
 
+# These commands restore the ownership and permissions of i2pd.
+	@echo "Giving ownership of i2pd back to root"
+	@chown root:wheel $$(which i2pd)
+	@chmod 755 $$(which i2pd)
+
 # This command removes the _i2pd user and its home if they exist.
 	@if userinfo -e _i2pd; then \
 		echo "Removing _i2pd user"; \