pidgin/purple-plugin-pack

These appear to not technically be needed, but explicitly including these
headers ourselves makes the code make slightly more sense.
EXTRA_DIST = \
Makefile.mingw \
plugins.cfg
showofflinedir = $(PURPLE_LIBDIR)
showoffline_la_LDFLAGS = -module -avoid-version
if HAVE_PURPLE
showoffline_LTLIBRARIES = showoffline.la
showoffline_la_SOURCES = \
showoffline.c
showoffline_la_LIBADD = \
$(GLIB_LIBS) \
$(PURPLE_LIBS)
endif
AM_CPPFLAGS = \
-DLIBDIR=\"$(PURPLE_LIBDIR)/libpurple/\" \
-DDATADIR=\"$(PURPLE_DATADIR)\" \
-DPIXMAPSDIR=\"$(PURPLE_PIXMAPSDIR)\" \
$(DEBUG_CFLAGS) \
$(PURPLE_CFLAGS)