Fix shebangs of the GDB hooks

Also, use -p (preserve timestamp) and -n (don't create backup files)
with pathfix.py.

Resolves https://bugzilla.redhat.com/show_bug.cgi?id=1560295

python3.spec

@@ -888,9 +888,10 @@ sed -i -e "s/'pyconfig.h'/'%{_pyconfig_h}'/" \
 # so handle files named using other naming scheme separately.
 LD_LIBRARY_PATH=./build/optimized ./build/optimized/python \
   Tools/scripts/pathfix.py \
-  -i "%{_bindir}/python%{pybasever}" \
+  -i "%{_bindir}/python%{pybasever}" -pn \
   %{buildroot} %{buildroot}%{pylibdir}/Tools/scripts/*-*.py \
-  %{buildroot}%{pylibdir}/Tools/pynche/{pynche,pynche.pyw}
+  %{buildroot}%{pylibdir}/Tools/pynche/{pynche,pynche.pyw} \
+  %{?with_gdb_hooks:%{buildroot}$DirHoldingGdbPy/*.py}
 # not covered, also redundant and useless:
 rm %{buildroot}%{pylibdir}/Tools/scripts/{2to3,idle3,pydoc3,pyvenv}