Build & config: Remove leftover files from the unsupported "make" build system

* Original commit: espressif/esp-idf@766aa57084

components/mdns/component.mk

@@ -1,7 +0,0 @@
-ifdef CONFIG_MDNS_NETWORKING_SOCKET
-COMPONENT_OBJEXCLUDE := mdns_networking_lwip.o
-else
-COMPONENT_OBJEXCLUDE := mdns_networking_socket.o
-endif
-COMPONENT_ADD_INCLUDEDIRS := include
-COMPONENT_PRIV_INCLUDEDIRS := private_include

components/mdns/test/component.mk

@@ -1,4 +0,0 @@
-#
-#Component Makefile
-#
-COMPONENT_ADD_LDFLAGS = -Wl,--whole-archive -l$(COMPONENT_NAME) -Wl,--no-whole-archive

examples/protocols/mdns/Makefile

@@ -1,10 +0,0 @@
-#
-# This is a project Makefile. It is assumed the directory this Makefile resides in is a
-# project subdirectory.
-#
-
-PROJECT_NAME := mdns_test
-
-EXTRA_COMPONENT_DIRS = $(IDF_PATH)/examples/common_components/protocol_examples_common
-
-include $(IDF_PATH)/make/project.mk

examples/protocols/mdns/main/component.mk

@@ -1,4 +0,0 @@
-#
-# "main" pseudo-component makefile.
-#
-# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)