net/mosquitto: install headers for auth plugin development

Signed-off-by: Dirk Feytons <dirk.feytons@gmail.com>

net/mosquitto/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mosquitto
 PKG_VERSION:=1.5.4
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_LICENSE:=BSD-3-Clause
 PKG_LICENSE_FILES:=LICENSE.txt
 PKG_CPE_ID:=cpe:/a:eclipse:mosquitto
@@ -193,6 +193,8 @@ define Build/InstallDev
 	$(INSTALL_DIR) $(1)/usr/include
 	$(CP) $(PKG_BUILD_DIR)/lib/mosquitto.h $(1)/usr/include
 	$(CP) $(PKG_BUILD_DIR)/lib/cpp/mosquittopp.h $(1)/usr/include
+	$(CP) $(PKG_BUILD_DIR)/src/mosquitto_plugin.h $(1)/usr/include
+	$(CP) $(PKG_BUILD_DIR)/src/mosquitto_broker.h $(1)/usr/include
 	$(INSTALL_DIR) $(1)/usr/lib
 	$(CP) $(PKG_BUILD_DIR)/lib/libmosquitto.so.1 $(1)/usr/lib/
 	$(CP) $(PKG_BUILD_DIR)/lib/cpp/libmosquittopp.so.1 $(1)/usr/lib/