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
xmpppriodir = $(PURPLE_LIBDIR)
xmppprio_la_LDFLAGS = -module -avoid-version
if HAVE_PURPLE
xmppprio_LTLIBRARIES = xmppprio.la
xmppprio_la_SOURCES = \
xmppprio.c
xmppprio_la_LIBADD = \
$(GLIB_LIBS) \
$(PURPLE_LIBS)
endif
AM_CPPFLAGS = \
-DLIBDIR=\"$(PURPLE_LIBDIR)\" \
-DDATADIR=\"$(PURPLE_DATADIR)\" \
-DPIXMAPSDIR=\"$(PURPLE_PIXMAPSDIR)\" \
$(DEBUG_CFLAGS) \
$(PURPLE_CFLAGS)