bpo-30983: [gdb] Fix py-bt, etc. for non-debug shared builds (#3153)

PEP 523 introduced _PyEval_EvalFrameDefault which inlines PyEval_EvalFrameEx on
non-debug shared builds.  This breaks the ability to use py-bt, py-up, and
a few other Python-specific gdb integrations.

This patch fixes the problem by only looking for _PyEval_EvalFrameDefault
frames.

test_gdb passes on both a debug and a non-debug build.

Original patch by Bruno "Polaco" Penteado.
diff --git a/Misc/ACKS b/Misc/ACKS
index e3e02eb..b2e0592 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1185,6 +1185,7 @@
 Andreas Pelme
 Steven Pemberton
 Bo Peng
+Bruno "Polaco" Penteado
 Santiago Peresón
 George Peristerakis
 Thomas Perl