Modify the ERR init functions to use the internal ERR string loaders

This deprecates all the ERR_load_ functions, and moves their definition to
separate C source files that can easily be removed when those functions are
finally removed.

This also reduces include/openssl/kdferr.h to include cryptoerr_legacy.h,
moves the declaration of ERR_load_ERR_strings() from include/openssl/err.h
to include/openssl/cryptoerr_legacy.h, and finally removes the declaration
of ERR_load_DSO_strings(), which was entirely internal anyway.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13390)

1 files changed, 1 insertions, 0 deletions

diff --git a/NEWS.md b/NEWS.md
index 2ba338c745..054a55324f 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -20,6 +20,7 @@ OpenSSL 3.0
 
 ### Major changes between OpenSSL 1.1.1 and OpenSSL 3.0 [under development]
 
+  * Deprecated the `ERR_load_` functions.
   * Remove the `RAND_DRBG` API.
   * Deprecated the `ENGINE` API.
   * Added `OSSL_LIB_CTX`, a libcrypto library context.