Fix mongoose/examples compilation with mingw

PUBLISHED_FROM=46800f43ba03082cc589d70e6118d754f4cdc9d0

examples/multithreaded_restful_server/Makefile

@@ -1,18 +1,4 @@
 PROG = multithreaded_restful_server
-SOURCES = $(PROG).c ../../mongoose.c
-APP_FLAGS = -DMG_ENABLE_THREADS $(CFLAGS_EXTRA)
-
-ifeq ($(OS), Windows_NT)
-APP_FLAGS += advapi32.lib
-endif
-
-all: $(PROG)
-
-$(PROG): $(SOURCES)
-	$(CC) $(SOURCES) -o $@ -W -Wall -I../.. -pthread $(APP_FLAGS)
-
-$(PROG).exe: $(SOURCES)
-	cl $(SOURCES) /I../.. /MD /Fe$@ $(APP_FLAGS)
-
-clean:
-	rm -rf *.gc* *.dSYM *.exe *.obj *.o a.out $(PROG)
+MODULE_CFLAGS = -DMG_ENABLE_THREADS
+SSL_LIB=open_ssl
+include ../examples.mk