Update POCO library.

vendor/POCO/Prometheus/Makefile

@@ -0,0 +1,28 @@
+#
+# Makefile
+#
+# Makefile for Poco Prometheus
+#
+
+include $(POCO_BASE)/build/rules/global
+
+objects = \
+	Collector \
+	Counter \
+	IntCounter \
+	Gauge \
+	IntGauge \
+	LabeledMetric \
+	Histogram \
+	Registry \
+	TextExporter \
+	MetricsRequestHandler \
+	MetricsServer \
+	ProcessCollector \
+	ThreadPoolCollector
+
+target         = PocoPrometheus
+target_version = $(LIBVERSION)
+target_libs    = PocoFoundation PocoNet
+
+include $(POCO_BASE)/build/rules/lib