add more system package debugging

sau/gentoo.py

@@ -117,6 +117,7 @@ def is_system_package(atom, eclasses):
     # sys-boot/ category should probably always be considered
     # system-packages
     if name.split('/')[0] == 'sys-boot':
+        log.debug(f"{name} is a sys-boot package")
         return True
 
     # libc-packages should be considered system-packages as they generally
@@ -124,6 +125,7 @@ def is_system_package(atom, eclasses):
     # then just checking for specific packages here, but as far as I know there
     # are not many of them anyway...
     if re.search(r'^sys-libs/(glibc|musl)', name):
+        log.debug(f"{name} is a libc package")
         return True
 
     if any([