Keep the colleague's microbu-esp32c5 tree in this repository

obu-firmware builds against vanetza-idf from microbu-esp32c5/external, but
that tree was gitignored, so a clone of this repository could not build the
firmware it ships. It is now committed here as ordinary files in its own
folder, microbu-esp32c5/: the colleague's commit cf4b99f plus the V2X2MAP
bridge's signature verification (--trust) used on the bench. Nothing is
fetched from or pushed to the colleague's repository; this repository and
its remotes carry everything. The folder's own .gitignore keeps build output,
downloaded components and private key material out, as it did there; the
committed file set is identical to that repository's tracked files.

The ESP32-C5 is still flashed from obu-firmware/, which only takes
vanetza-idf from microbu-esp32c5/, so the two stay separate folders.
FLASHING.md says how to take a newer version of the colleague's tree (copy
it over the folder, rebuild, test, commit).

microbu-esp32c5/external/vanetza-idf/vanetza/asn1/support/GraphicString.h

@@ -0,0 +1,58 @@
+/*-
+ * Copyright (c) 2003-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#ifndef	_GraphicString_H_
+#define	_GraphicString_H_
+
+#include "OCTET_STRING.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef OCTET_STRING_t GraphicString_t;	/* Implemented via OCTET STRING */
+
+extern asn_TYPE_descriptor_t asn_DEF_GraphicString;
+extern asn_TYPE_operation_t asn_OP_GraphicString;
+
+#define GraphicString_free OCTET_STRING_free
+
+#if !defined(ASN_DISABLE_PRINT_SUPPORT)
+#define GraphicString_print OCTET_STRING_print
+#endif  /* !defined(ASN_DISABLE_PRINT_SUPPORT) */
+
+#define GraphicString_compare OCTET_STRING_compare
+#define GraphicString_copy    OCTET_STRING_copy
+
+#define GraphicString_constraint asn_generic_unknown_constraint
+
+#if !defined(ASN_DISABLE_BER_SUPPORT)
+#define GraphicString_decode_ber OCTET_STRING_decode_ber
+#define GraphicString_encode_der OCTET_STRING_encode_der
+#endif  /* !defined(ASN_DISABLE_BER_SUPPORT) */
+
+#if !defined(ASN_DISABLE_XER_SUPPORT)
+#define GraphicString_decode_xer OCTET_STRING_decode_xer_hex
+#define GraphicString_encode_xer OCTET_STRING_encode_xer
+#endif  /* !defined(ASN_DISABLE_XER_SUPPORT) */
+
+#if !defined(ASN_DISABLE_JER_SUPPORT)
+#define GraphicString_decode_jer OCTET_STRING_decode_jer
+#define GraphicString_encode_jer OCTET_STRING_encode_jer
+#endif  /* !defined(ASN_DISABLE_JER_SUPPORT) */
+
+#if !defined(ASN_DISABLE_UPER_SUPPORT)
+#define GraphicString_decode_uper OCTET_STRING_decode_uper
+#define GraphicString_encode_uper OCTET_STRING_encode_uper
+#endif  /* !defined(ASN_DISABLE_UPER_SUPPORT) */
+#if !defined(ASN_DISABLE_APER_SUPPORT)
+#define GraphicString_decode_aper OCTET_STRING_decode_aper
+#define GraphicString_encode_aper OCTET_STRING_encode_aper
+#endif  /* !defined(ASN_DISABLE_APER_SUPPORT) */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _GraphicString_H_ */