Deprecate most of debug-memory

Fixes #8322

The leak-checking (and backtrace option, on some platforms) provided
by crypto-mdebug and crypto-mdebug-backtrace have been mostly neutered;
only the "make malloc fail" capability remains.  OpenSSL recommends using
the compiler's leak-detection instead.

The OPENSSL_DEBUG_MEMORY environment variable is no longer used.
CRYPTO_mem_ctrl(), CRYPTO_set_mem_debug(), CRYPTO_mem_leaks(),
CRYPTO_mem_leaks_fp() and CRYPTO_mem_leaks_cb() return a failure code.
CRYPTO_mem_debug_{malloc,realloc,free}() have been removed.  All of the
above are now deprecated.

Merge (now really small) mem_dbg.c into mem.c

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10572)

1 files changed, 0 insertions, 7 deletions

diff --git a/test/bio_memleak_test.c b/test/bio_memleak_test.c
index dab61f6f9a..49ee712a49 100644
--- a/test/bio_memleak_test.c
+++ b/test/bio_memleak_test.c
@@ -221,13 +221,6 @@ finish:
     return ok;
 }
 
-int global_init(void)
-{
-    CRYPTO_set_mem_debug(1);
-    CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
-    return 1;
-}
-
 int setup_tests(void)
 {
     ADD_TEST(test_bio_memleak);