check: Only test pcnet when it is compiled in

Signed-off-by: NJuan Quintela <quintela@redhat.com>
Reviewed-by: NThomas Huth <thuth@redhat.com>

tests/Makefile.include

@@ -217,9 +217,9 @@ check-qtest-pci-y += tests/e1000e-test$(EXESUF)
 gcov-files-pci-y += hw/net/e1000e.c hw/net/e1000e_core.c
 check-qtest-pci-y += tests/rtl8139-test$(EXESUF)
 gcov-files-pci-y += hw/net/rtl8139.c
-check-qtest-pci-y += tests/pcnet-test$(EXESUF)
-gcov-files-pci-y += hw/net/pcnet.c
-gcov-files-pci-y += hw/net/pcnet-pci.c
+check-qtest-pci-$(CONFIG_PCNET_PCI) += tests/pcnet-test$(EXESUF)
+gcov-files-pci-$(CONFIG_PCNET_PCI) += hw/net/pcnet.c
+gcov-files-pci-$(CONFIG_PCNET_PCI) += hw/net/pcnet-pci.c
 check-qtest-pci-$(CONFIG_EEPRO100_PCI) += tests/eepro100-test$(EXESUF)
 gcov-files-pci-$(CONFIG_EEPRO100_PCI) += hw/net/eepro100.c
 check-qtest-pci-$(CONFIG_NE2000_PCI) += tests/ne2000-test$(EXESUF)