Since the recent Makefile.am rework both usb-db and pci-db were built to
read the usb.ids database file. This fix makes sure pci-db properly
reads pci.ids instead.
Originally pointed out by Marco d'Itri.
# pci-db - read PCI vendor/device string database
# ------------------------------------------------------------------------------
extras_usb_db_pci_db_SOURCES = extras/usb-db/usb-db.c
-extras_usb_db_pci_db_CPPFLAGS = $(AM_CPPFLAGS) -DPCI_DATABASE=\"$(USB_DATABASE)\" -DBUILD_FOR_PCI
+extras_usb_db_pci_db_CPPFLAGS = $(AM_CPPFLAGS) -DPCI_DATABASE=\"$(PCI_DATABASE)\" -DBUILD_FOR_PCI
extras_usb_db_pci_db_LDADD = libudev/libudev-private.la
libexec_PROGRAMS += extras/usb-db/pci-db