This code has been introduced by Upstream in the commit:
  https://github.com/mariadb-corporation/mariadb-connector-c/commit/1acb81e
and later modified in the:
  https://github.com/mariadb-corporation/mariadb-connector-c/commit/5f88f50
between the version mariadb-connector-c 3.3.5 and 3.3.7

It results in a lot of warnings being treated as errors and thus killing the compilation.
Specifically lot of occuerences of these:
| libmariadb/ma_client_plugin.c:83:39: error: type of ‘mysql_native_password_client_plugin’ does not match original declaration [-Werror=lto-type-mismatch]
| libmariadb/ma_client_plugin.c:84:39: error: type of ‘mysql_old_password_client_plugin’ does not match original declaration [-Werror=lto-type-mismatch]
| libmariadb/ma_client_plugin.c:85:39: error: type of ‘zlib_client_plugin’ does not match original declaration [-Werror=lto-type-mismatch]
| libmariadb/ma_client_plugin.c:86:39: error: type of ‘pvio_socket_client_plugin’ does not match original declaration [-Werror=lto-type-mismatch]

Note: These warnings were present even before:
e.g. this build.log of release 3.3.5:
  https://koji.fedoraproject.org/koji/buildinfo?buildID=2244099
  https://kojipkgs.fedoraproject.org//packages/mariadb-connector-c/3.3.5/2.fc39/data/logs/x86_64/build.log
  search for "[-Wlto-type-mismatch]"

The difference is that since they started to be treated as errors and thus killing the build.

--- mariadb-connector-c-3.3.8-src/CMakeLists.txt	2023-11-01 11:28:04.000000000 +0100
+++ mariadb-connector-c-3.3.8-src/CMakeLists.txt_patched	2024-01-12 20:57:58.031375024 +0100
@@ -395,16 +395,6 @@ ENDIF()
 MESSAGE1(SYSTEM_LIBS "SYSTEM_LIBS ${SYSTEM_LIBS}")
 MARK_AS_ADVANCED(SYSTEM_LIBS)
 
-IF(NOT IS_SUBPROJECT)
-IF ((NOT WIN32) AND (CMAKE_C_COMPILER_ID MATCHES "Clang" OR CMAKE_C_COMPILER_ID MATCHES "GNU"))
-  SET(WARNING_AS_ERROR "-Werror")
-ELSEIF(CMAKE_C_COMPILER_ID MATCHES "MSVC")
-  SET(WARNING_AS_ERROR "/WX")
-ENDIF()
-SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${WARNING_AS_ERROR}")
-ENDIF()
-
-
 IF(NOT REMOTEIO_PLUGIN_TYPE MATCHES "OFF")
   IF(CURL_FOUND)
     INCLUDE_DIRECTORIES(${CURL_INCLUDE_DIRS})