move pygetopt.h to internal (closes bpo-32264) (#4830)

diff --git a/Makefile.pre.in b/Makefile.pre.in
index fcce62f..4fe9aff 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -987,7 +987,6 @@
 		$(srcdir)/Include/pyhash.h \
 		$(srcdir)/Include/pylifecycle.h \
 		$(srcdir)/Include/pymath.h \
-		$(srcdir)/Include/pygetopt.h \
 		$(srcdir)/Include/pymacro.h \
 		$(srcdir)/Include/pymem.h \
 		$(srcdir)/Include/pyport.h \
@@ -1017,6 +1016,7 @@
 		$(srcdir)/Include/internal/ceval.h \
 		$(srcdir)/Include/internal/gil.h \
 		$(srcdir)/Include/internal/mem.h \
+		$(srcdir)/Include/internal/pygetopt.h \
 		$(srcdir)/Include/internal/pystate.h \
 		$(srcdir)/Include/internal/warnings.h \
 		$(DTRACE_HEADERS)