Related tdf#122560 tdf#135202: build plugin caching_sha2_pw for MariaDb/Mysql

Taking a look at:
https://dev.mysql.com/doc/refman/8.0/en/caching-sha2-pluggable-authentication.html
"caching_sha2_password" is better than "sha256_password" plugin
Notice that "sha2" in "caching_sha2_password" refers, as the quoted url indicates:
'more generally to the SHA-2 class of encryption algorithms, of which 256-bit encryption is one instance'

Change-Id: Icbbe45f4f20345da2fb5a262b4d85bce3a1fecd9
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/104172
Tested-by: Julien Nabet <serval2412@yahoo.fr>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
(cherry picked from commit ee8d735f0a59f41fb1f5cbabfe089c222ca948e3)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/104150
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@cib.de>
diff --git a/external/mariadb-connector-c/StaticLibrary_mariadb-connector-c.mk b/external/mariadb-connector-c/StaticLibrary_mariadb-connector-c.mk
index 89d4bfb..86d127c 100644
--- a/external/mariadb-connector-c/StaticLibrary_mariadb-connector-c.mk
+++ b/external/mariadb-connector-c/StaticLibrary_mariadb-connector-c.mk
@@ -64,6 +64,7 @@ $(eval $(call gb_StaticLibrary_add_generated_cobjects,mariadb-connector-c,\
	UnpackedTarball/mariadb-connector-c/libmariadb/mariadb_stmt \
	UnpackedTarball/mariadb-connector-c/libmariadb/ma_client_plugin \
	UnpackedTarball/mariadb-connector-c/plugins/auth/my_auth \
	UnpackedTarball/mariadb-connector-c/plugins/auth/caching_sha2_pw \
	UnpackedTarball/mariadb-connector-c/plugins/pvio/pvio_socket \
	$(if $(filter $(OS),WNT), \
		UnpackedTarball/mariadb-connector-c/libmariadb/win32_errmsg \