Export jl_n_threads from the public libjulia library [#38925]

imciner2 · staticfloat · commit a9c0859f934b · 2021-01-15T00:00:39.000Z
(cherry picked from commit ea39b70)
diff --git a/src/jl_exported_data.inc b/src/jl_exported_data.inc
@@ -62,6 +62,7 @@
     XX(jl_methoderror_type) \
     XX(jl_methtable_type) \
     XX(jl_module_type) \
+    XX(jl_n_threads) \
     XX(jl_namedtuple_type) \
     XX(jl_namedtuple_typename) \
     XX(jl_newvarnode_type) \
