bug#28981: Not all Borg C / Cython files are built from source

[Leo Famulari]

I noticed that the latest Borg versions have a new source code directory
structure which breaks our efforts to delete the generated C files and
rebuild them with Cython.

For Borg 1.1.1:

$ grep -rI 'Generated by Cython'
src/borg/algorithms/checksums.c:/* Generated by Cython 0.26.1 */
src/borg/chunker.c:/* Generated by Cython 0.26.1 */
src/borg/compress.c:/* Generated by Cython 0.26.1 */
src/borg/crc32.c:/* Generated by Cython 0.26 */
src/borg/crypto/low_level.c:/* Generated by Cython 0.26.1 */
src/borg/crypto.c:/* Generated by Cython 0.26 */
src/borg/hashindex.c:/* Generated by Cython 0.26.1 */
src/borg/item.c:/* Generated by Cython 0.26.1 */
src/borg/platform/darwin.c:/* Generated by Cython 0.26.1 */
src/borg/platform/freebsd.c:/* Generated by Cython 0.26.1 */
src/borg/platform/linux.c:/* Generated by Cython 0.26.1 */
src/borg/platform/posix.c:/* Generated by Cython 0.26.1 */

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