Add conditional support for RTEMS PCI to the waf build.

Check for the "rtems/pci.h" header and provide conditional build support
with waf to build for BSPs that do not have PCI support. The Makefile build
always defines HAVE_RTEMS_PCI_H which is the same state with this change.

The PCI calls still exist however they do nothing and return a constant.
Any PCI based driver that makes these calls on a BSP that does not have
PCI support will not work which is understandable. Either change the
driver or add PCI support the BSP.

makefile.py

@@ -191,6 +191,7 @@ class ModuleManager(builder.ModuleManager):
                'COMMON_FLAGS += -ImDNSResponder/mDNSShared\n' \
                'COMMON_FLAGS += -ImDNSResponder/mDNSPosix\n' \
                'COMMON_FLAGS += -Itestsuite/include\n' \
+               'COMMON_FLAGS += -DHAVE_RTEMS_PCI_H=1\n' \
                'COMMON_FLAGS += -Wall\n' \
                'COMMON_FLAGS += -Wno-format\n' \
                'COMMON_FLAGS += -MT $@ -MD -MP -MF $(basename $@).d\n' \