Encourage our old python3-cryptography to at least start to work with OpenSSL 3.

- Backport one patch to err.py to remove a symbol which has been removed in
  OpenSSL 3, and isn't used in python3-cryptography.
  (50ec692749b7e2e62685b443f5e629627b03987e)

- Backport the detection of OpenSSL 3 and don't link to FIPS_mode/FIPS_mode_set
  (parts of f08a7de651f9e6475c8c0a67d2a61ed8b669ddf6)

This is *not* a complete backport of the 3.0 support, but is enough that packages
such as imgtool can import python3-cryptography and operate until the upgrade is
ready.

Upstream-Status: Inappropriate
Signed-off-by: Ross Burton <ross.burton@arm.com>

diff --git a/src/_cffi_src/openssl/cryptography.py b/src/_cffi_src/openssl/cryptography.py
index f24bee5a..920a86de 100644
--- a/src/_cffi_src/openssl/cryptography.py
+++ b/src/_cffi_src/openssl/cryptography.py
@@ -35,6 +35,8 @@ INCLUDES = """
 
 #define CRYPTOGRAPHY_OPENSSL_110F_OR_GREATER \
     (OPENSSL_VERSION_NUMBER >= 0x1010006f && !CRYPTOGRAPHY_IS_LIBRESSL)
+#define CRYPTOGRAPHY_OPENSSL_300_OR_GREATER \
+    (OPENSSL_VERSION_NUMBER >= 0x30000000 && !CRYPTOGRAPHY_IS_LIBRESSL)
 
 #define CRYPTOGRAPHY_OPENSSL_LESS_THAN_110J \
     (OPENSSL_VERSION_NUMBER < 0x101000af || CRYPTOGRAPHY_IS_LIBRESSL)
@@ -54,6 +56,7 @@ INCLUDES = """
 
 TYPES = """
 static const int CRYPTOGRAPHY_OPENSSL_110F_OR_GREATER;
+static const int CRYPTOGRAPHY_OPENSSL_300_OR_GREATER;
 
 static const int CRYPTOGRAPHY_OPENSSL_LESS_THAN_111;
 static const int CRYPTOGRAPHY_OPENSSL_LESS_THAN_111B;
diff --git a/src/_cffi_src/openssl/err.py b/src/_cffi_src/openssl/err.py
index 0dd74146..42bab4d9 100644
--- a/src/_cffi_src/openssl/err.py
+++ b/src/_cffi_src/openssl/err.py
@@ -40,7 +40,6 @@ void ERR_clear_error(void);
 void ERR_put_error(int, int, int, const char *, int);
 
 int ERR_GET_LIB(unsigned long);
-int ERR_GET_FUNC(unsigned long);
 int ERR_GET_REASON(unsigned long);
 
 """
diff --git a/src/_cffi_src/openssl/fips.py b/src/_cffi_src/openssl/fips.py
index c92bca49..38bfa231 100644
--- a/src/_cffi_src/openssl/fips.py
+++ b/src/_cffi_src/openssl/fips.py
@@ -18,7 +18,7 @@ int FIPS_mode(void);
 """
 
 CUSTOMIZATIONS = """
-#if CRYPTOGRAPHY_IS_LIBRESSL
+#if CRYPTOGRAPHY_IS_LIBRESSL || CRYPTOGRAPHY_OPENSSL_300_OR_GREATER
 static const long Cryptography_HAS_FIPS = 0;
 int (*FIPS_mode_set)(int) = NULL;
 int (*FIPS_mode)(void) = NULL;