Add TLS support

tutorials/websocket/websocket-client/Makefile

@@ -3,6 +3,7 @@ DELETE = rm -rf                   # Command to remove files
 OUT ?= -o $(PROG)                 # Compiler argument for output file
 SOURCES = main.c mongoose.c       # Source code files
 CFLAGS = -W -Wall -Wextra -g -I.  # Build options
+CFLAGS_MONGOOSE ?= -DMG_TLS=MG_TLS_BUILTIN
 
 # Mongoose build options. See https://mongoose.ws/documentation/#build-options
 #CFLAGS_MONGOOSE += -DMG_ENABLE_LINES