This cleans up `LDR_DONT_RESOLVE_REFS` checks in preparation for !7.
-- v4: ntdlll: Remove redundant LDR_DONT_RESOLVE_REFS checks before calling process_attach(). ntdll: Skip DLL initialization and ldr notification entirely if DONT_RESOLVE_DLL_REFERENCES is set. kernel32/tests: Test for unexpected loader notification for import dependency loaded with DONT_RESOLVE_DLL_REFERENCES.