distrodata/maintainers: Add PARSE_ALL_RECIPES flag to fix test issues

Currently the test depends on which DISTRO_FEATURES and targets are selected.
Similar to SOURCE_MIRROR_FETCH, add PARSE_ALL_RECIPES to allow the test to see
a much wider range of them. This avoids issues added by the new ucontext musl
specific recipe and allows the current whitelist to be cleared out a bit (more
cleanup can follow).

(From OE-Core rev: c139e058bb2df48c79784cf3fd701e51bbc68427)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/base.bbclass

@@ -496,7 +496,7 @@ python () {
         d.appendVarFlag('do_devshell', 'depends', ' virtual/fakeroot-native:do_populate_sysroot')
 
     need_machine = d.getVar('COMPATIBLE_MACHINE')
-    if need_machine:
+    if need_machine and not d.getVar('PARSE_ALL_RECIPES', False):
         import re
         compat_machines = (d.getVar('MACHINEOVERRIDES') or "").split(":")
         for m in compat_machines:
@@ -505,7 +505,7 @@ python () {
         else:
             raise bb.parse.SkipRecipe("incompatible with machine %s (not in COMPATIBLE_MACHINE)" % d.getVar('MACHINE'))
 
-    source_mirror_fetch = d.getVar('SOURCE_MIRROR_FETCH', False)
+    source_mirror_fetch = d.getVar('SOURCE_MIRROR_FETCH', False) or d.getVar('PARSE_ALL_RECIPES', False)
     if not source_mirror_fetch:
         need_host = d.getVar('COMPATIBLE_HOST')
         if need_host:

meta/classes/features_check.bbclass

@@ -23,6 +23,9 @@
 # Copyright 2013 (C) O.S. Systems Software LTDA.
 
 python () {
+    if d.getVar('PARSE_ALL_RECIPES', False):
+        return
+
     # Assume at least one var is set.
     distro_features = set((d.getVar('DISTRO_FEATURES') or '').split())