Added libsodium dependency

Makefile.am

@@ -6,8 +6,8 @@ src_coincerd_SOURCES = \
 	src/coincerd.c \
 	src/p2p.c src/p2p.h
 
-src_coincerd_CFLAGS = $(AM_CFLAGS) $(JANSSON_CFLAGS) $(LIBEVENT_CFLAGS)
-src_coincerd_LDADD  = $(AM_LDADD) $(JANSSON_LIBS) $(LIBEVENT_LIBS)
+src_coincerd_CFLAGS = $(AM_CFLAGS) $(JANSSON_CFLAGS) $(LIBEVENT_CFLAGS) $(LIBSODIUM_CFLAGS)
+src_coincerd_LDADD  = $(AM_LDADD) $(JANSSON_LIBS) $(LIBEVENT_LIBS) $(LIBSODIUM_LIBS)
 
 src_coincer_SOURCES = \
 	src/coincer.c

configure.ac

@@ -27,6 +27,7 @@ dnl Checks for libraries.
 PKG_PROG_PKG_CONFIG
 PKG_CHECK_MODULES([JANSSON], [jansson])
 PKG_CHECK_MODULES([LIBEVENT], [libevent])
+PKG_CHECK_MODULES([LIBSODIUM], [libsodium])
 
 dnl Checks for header files.