avoid try/catch in finalizers

Author: Christopher Doris

src/PyBuffer.jl

@@ -26,7 +26,7 @@ mutable struct PyBuffer
         b = new(info)
         finalizer(b) do b
             if CONFIG.isinitialized
-                err = with_gil() do
+                err = with_gil(false) do
                     C.PyBuffer_Release(pointer(b.info))
                 end
                 check(err)

src/PyObjectArray.jl

@@ -4,7 +4,7 @@ mutable struct PyObjectArray{N} <: AbstractArray{PyObject, N}
         x = new{N}(fill(CPyPtr(C_NULL), dims))
         finalizer(x) do x
             if CONFIG.isinitialized
-                with_gil() do
+                with_gil(false) do
                     for ptr in x.ptrs
                         C.Py_DecRef(ptr)
                     end

src/object.jl

@@ -14,7 +14,7 @@ mutable struct PyObject
             if CONFIG.isinitialized
                 ptr = getfield(o, :ptr)
                 if ptr != C_NULL
-                    with_gil() do
+                    with_gil(false) do
                         C.Py_DecRef(ptr)
                     end
                 end