Remove unresolvable dependency names from the buildreq_cache

The buildreq cache should only contain names/symbols/etc that are
resolvable at build time. The names may indicate missing packages, but
they may also be invalid, so it is best to avoid adding the names to the
cache in the first place.

Fixes clearlinux#480

Signed-off-by: Patrick McCarty <patrick.mccarty@intel.com>

autospec/build.py

@@ -191,7 +191,10 @@ def parse_buildroot_log(filename, returncode):
     for line in loglines:
         match = missing_pat.match(line)
         if match is not None:
-            util.print_fatal("Cannot resolve dependency name: {}".format(match.group(1)))
+            name = match.group(1)
+            util.print_fatal("Cannot resolve dependency name: {}".format(name))
+            # Avoid adding the dependency name to the buildreq cache
+            buildreq.remove_buildreq(name)
             is_clean = False
 
     return is_clean