disable backtrace for now. maybe possible to enable now that we have
libexecinfo in base, but needs checking to make sure we don't end up
with unresolved symbols.

Index: numpy/_core/meson.build
--- numpy/_core/meson.build.orig
+++ numpy/_core/meson.build
@@ -291,7 +291,6 @@ endforeach
 
 # Other optional functions
 optional_misc_funcs = [
-  'backtrace',
   'madvise',
 ]
 foreach func: optional_misc_funcs
