Viktor Szakats 606c102e52 build: enable -Wcast-qual, fix fallouts ...

- enable compiler warning `-Wcast-qual`.
- add `LIBSSH2_UNCONST()` macro to strip const where absolutely
  necessary to avoid compiler warnings.
- fix const stripping by constifying where necessary.
- fix const stripping by using `LIBSSH2_UNCONST()`.
- libgcrypt.h: drop unnecessary casts.
- openssl: fix to use new `BIO_new_mem_buf()` parameter types
  with wolfSSL.

Cherry-picked from #1484
Closes #1527

2025-01-31 00:57:26 +01:00

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