move to new skeleton

tutorials/core/multi-threaded/Makefile

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+SOURCES = main.c mongoose.c       # Source code files
+CFLAGS = -W -Wall -Wextra -g -I.  # Build options
+
+# Mongoose build options. See https://mongoose.ws/documentation/#build-options
+CFLAGS_MONGOOSE +=
+
+ifeq ($(OS),Windows_NT)
+  # Windows settings. Assume MinGW compiler. To use VC: make CC=cl CFLAGS=/MD
+  PROG ?= example.exe                 # Use .exe suffix for the binary
+  CC = gcc                            # Use MinGW gcc compiler
+  CFLAGS += -lws2_32                  # Link against Winsock library
+  CFLAGS += -Wno-cast-function-type   # Thread functions return void instead of void *
+  DELETE = cmd /C del /f /q /s        # Command prompt command to delete files
+else
+  # Mac, Linux
+  PROG ?= example
+  CFLAGS += -lpthread                 # Link against POSIX threads library
+  DELETE = rm -rf
+endif
+
+all: $(PROG)
+	$(RUN) ./$(PROG) $(ARGS)
+
+$(PROG): $(SOURCES)
+	$(CC) $(SOURCES) $(CFLAGS) $(CFLAGS_MONGOOSE) $(CFLAGS_EXTRA) -o $@
+
+clean:
+	$(DELETE) $(PROG) *.o *.obj *.exe *.dSYM