Corrected installation path for *.h files of *.drv files
The ppdc (and underlying functions) of libppd searches for include
files in /usr/share/ppdc and not in /usr/share/cups/ppdc any more.
@@ -100,7 +100,7 @@ EXTRA_DIST += $(gendrvfiles)
# =======================
# Definitions for drivers
# =======================
-pkgppdcdir = $(CUPS_DATADIR)/ppdc
+pkgppdcdir = $(datadir)/ppdc
genppdcfiles = \
filter/pcl.h \
