pidgin/purple-plugin-pack

Re-add purple2 compatibility with #if PURPLE_VERSION_CHECK(3,0,0) blocks

Based on previous commits between 2.7.0 and now, this is sorta like reverting
those changes partially.
EXTRA_DIST = \
Makefile.mingw \
plugins.cfg
listlogdir = $(PIDGIN_LIBDIR)
listlog_la_LDFLAGS = -module -avoid-version
if HAVE_PIDGIN
listlog_LTLIBRARIES = listlog.la
listlog_la_LIBADD = \
$(PIDGIN_LIBS) \
$(GLIB_LIBS)
listlog_la_SOURCES = listlog.c
endif
AM_CPPFLAGS = \
-DLIBDIR=\"$(PIDGIN_LIBDIR)\" \
-DDATADIR=\"$(PIDGIN_DATADIR)\" \
$(DEBUG_CFLAGS) \
$(PIDGIN_CFLAGS) \
$(GTK_CFLAGS) \
$(GLIB_CFLAGS)