build: don't link argon2

Linking Argon2 shouldn't be needed as Argon2
is a private OpenDHT dependency.

Change-Id: Id46aee27cb09a8af36912b59f74d62dbec0839aa
Reviewed-by: Philippe Gorley <philippe.gorley@savoirfairelinux.com>

configure.ac

@@ -603,9 +603,6 @@ AM_CONDITIONAL([BUILD_OPUS], [test "$HAVE_OPUS" -eq 1])
 dnl check for openDHT
 PKG_CHECK_MODULES([OPENDHT], [opendht >= 0.6.1],, AC_MSG_WARN([Missing OpenDHT]))
 
-dnl check for argon2
-PKG_CHECK_MODULES([ARGON2], [libargon2],, AC_MSG_FAILURE([Missing Argon2]))
-
 PKG_CHECK_MODULES([SECP256K1], [libsecp256k1 >= 0.1],, AC_MSG_FAILURE([Missing secp256k1]))
 
 dnl IPv6 mode is default-disabled

src/Makefile.am

@@ -58,8 +58,7 @@ libring_la_LDFLAGS = \
 		@PORTAUDIO_LIBS@ \
 		@GNUTLS_LIBS@ \
 		@OPENDHT_LIBS@ \
-		@ARGON2_LIBS@ \
-        @SECP256K1_LIBS@ \
+		@SECP256K1_LIBS@ \
 		@ZLIB_LIBS@ \
 		$(PCRE_LIBS) \
 		@LIBS@
@@ -82,8 +81,7 @@ libring_la_CFLAGS = \
 		@SPEEXDSP_CFLAGS@ \
 		@PORTAUDIO_CFLAGS@ \
 		@GNUTLS_CFLAGS@ \
-		@OPENDHT_CFLAGS@ \
-		@ARGON2_CFLAGS@
+		@OPENDHT_CFLAGS@
 
 libring_la_CXXFLAGS = @JSONCPP_CFLAGS@