Add module extsayng, rename previous one to extsay_old
This new module is based on the screen utility, but it should be much safer
to use.
if INSTALL_MODULE_EXTSAYNG
pkglib_LTLIBRARIES = libextsayng.la
libextsayng_la_SOURCES = extsayng.c
libextsayng_la_LDFLAGS = -module -avoid-version -shared
LDADD = $(GLIB_LIBS) $(MCABBER_LIBS)
AM_CPPFLAGS = -I$(top_srcdir) $(GLIB_CFLAGS) $(MCABBER_CFLAGS)
endif