Add curl dep

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "deps/json-c"]
 	path = deps/json-c
 	url = https://github.com/json-c/json-c.git
+[submodule "deps/curl"]
+	path = deps/curl
+	url = https://github.com/curl/curl.git

deps/build.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+set -e
+set -x
+
+cd json-c
+./autogen.sh
+./configure
+make -j24
+make install DESTDIR=$PWD/../build/
+cd ../
+
+
+# Note: in curl we've disabled the resolver and ssl. We have no DNS resolution or SSL support.
+cd curl
+./buildconf
+./configure --enable-static=on --without-ssl --without-zlib --disable-shared --without-resolver
+make -j24
+make install DESTDIR=$PWD/../build/
+cd ../

deps/curl

@@ -0,0 +1 @@
+Subproject commit 91d03fce9634bbaab0129a1d98d2b4fc61bf1d1b

src/Makefile

@@ -1,7 +1,7 @@
 CC=cc
 CFLAGS := -g -I. -Wall -Wpedantic -I ../deps/build/usr/local/include/
 LDFLAGS = -L ../deps/build/usr/local/lib/
-LDLIBS = -ljson-c
+LDLIBS = -ljson-c -lcurl -lpthread
 LDFLAGS += $(LDLIBS)
 CFLAGS_STATIC = $(CFLAGS) --static
 OBJ=main.o pfparser.o sysparser.o