Fix python-gdb.py: get C types on demand

Issue #26799: Fix python-gdb.py: don't get C types once when the Python code is
loaded, but get C types on demand. The C types can change if python-gdb.py is
loaded before the Python executable. Patch written by Thomas Ilsche.
diff --git a/Misc/ACKS b/Misc/ACKS
index 4077b5b..eaee334 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -618,6 +618,7 @@
 Mihai Ibanescu
 Ali Ikinci
 Aaron Iles
+Thomas Ilsche
 Lars Immisch
 Bobby Impollonia
 Meador Inge