Update build/add argh as dependency

Author: sid-code

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "libnop"]
 	path = libnop
 	url = [email protected]:google/libnop
+[submodule "argh"]
+	path = argh
+	url = https://github.com/adishavit/argh

Makefile

@@ -5,16 +5,18 @@ OBJECTS = $(SOURCES:%.cpp=%.o)
 PROGRAM = $(shell basename `pwd`)
 
 CC := $(shell which gcc || which clang)
-CFLAGS = -g -O0 -Wall -Wextra -fno-exceptions -fno-rtti --std=c++17
-INCLUDES = -I. -I./libnop/include/
+CFLAGS = -Wall -Wextra -fno-exceptions -fno-rtti --std=c++17
+OPTFLAGS ?= "-Ofast"
+
+INCLUDES = -I. -I./libnop/include/ -I./argh/
 LIBS = stdc++ m ssl crypto
 LDFLAGS = $(LIBS:%=-l%)
 
 $(PROGRAM) : $(OBJECTS)
 	$(CC) $(LDFLAGS) -o $@ $(OBJECTS)
 
 %.o : %.cpp $(HEADERS)
-	$(CC) $(CFLAGS) -c -o $@ $< $(INCLUDES)
+	$(CC) $(CFLAGS) $(OPTFLAGS) -c -o $@ $< $(INCLUDES)
 
 .PHONY : clean
 clean :