Link external libraries to libaria2 with --enable-libaria2

src/Makefile.am

@@ -716,7 +716,6 @@ endif # !ENABLE_LIBARIA2
 
 libaria2_la_SOURCES = $(SRCS)
 
-libaria2_la_LIBADD = @WSLAY_LIBS@ @LTLIBINTL@
 
 AM_CPPFLAGS = \
 	-I$(top_srcdir)/lib -I$(top_srcdir)/intl\
@@ -743,7 +742,7 @@ AM_LDFLAGS = \
 	@EXTRALDFLAGS@ \
 	@APPLETLS_LDFLAGS@
 
-LDADD = libaria2.la @ALLOCA@ \
+EXTLDADD = @ALLOCA@ \
 	@EXTRALIBS@ \
 	@ZLIB_LIBS@ \
 	@LIBUV_LIBS@ \
@@ -762,6 +761,14 @@ LDADD = libaria2.la @ALLOCA@ \
 	@TCMALLOC_LIBS@ \
 	@JEMALLOC_LIBS@
 
+LDADD = libaria2.la
+
+if ENABLE_LIBARIA2
+libaria2_la_LIBADD = $(EXTLDADD)
+else # !ENABLE_LIBARIA2
+LDADD += $(EXTLDADD)
+endif # !ENABLE_LIBARIA2
+
 AM_CFLAGS = @EXTRACFLAGS@
 
 AM_CXXFLAGS = @WARNCXXFLAGS@ @CXX1XCXXFLAGS@ @EXTRACXXFLAGS@