package/dovecot: add missing mariadb dependencies for mysql support

Buildroot commit [1] removed mysql and replaced it by mariadb in all
packages, but did not propagated all dependencies.

This commit fixes the issue.

Fixes:

    WARNING: unmet direct dependencies detected for BR2_PACKAGE_MARIADB
      Depends on [n]: BR2_INSTALL_LIBSTDCPP [=y] && !BR2_STATIC_LIBS [=n] && BR2_USE_MMU [=y] && BR2_TOOLCHAIN_HAS_THREADS [=y] && (BR2_TOOLCHAIN_HAS_ATOMIC [=n] || BR2_TOOLCHAIN_HAS_SYNC_8 [=n]) && BR2_USE_WCHAR [=y]
      Selected by [y]:
      - BR2_PACKAGE_DOVECOT_MYSQL [=y] && BR2_PACKAGE_DOVECOT [=y] && BR2_INSTALL_LIBSTDCPP [=y] && BR2_TOOLCHAIN_HAS_THREADS [=y]

[1] https://gitlab.com/buildroot.org/buildroot/-/commit/8708f3a23a7e28fdb04fc57406e13e6b7ff4a337

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/dovecot/Config.in

@@ -21,12 +21,16 @@ config BR2_PACKAGE_DOVECOT_MYSQL
 	bool "mysql support"
 	depends on BR2_INSTALL_LIBSTDCPP # mariadb
 	depends on BR2_TOOLCHAIN_HAS_THREADS # mariadb
+	depends on BR2_TOOLCHAIN_HAS_ATOMIC || BR2_TOOLCHAIN_HAS_SYNC_8 # mariadb
+	depends on BR2_USE_WCHAR # mariadb
 	select BR2_PACKAGE_MARIADB
 	help
 	  Enable MySQL support.
 
-comment "mysql support needs a toolchain w/ C++, threads"
-	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS
+comment "mysql support needs a toolchain w/ C++, threads, wchar"
+	depends on BR2_TOOLCHAIN_HAS_ATOMIC || BR2_TOOLCHAIN_HAS_SYNC_8
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS || \
+		!BR2_USE_WCHAR
 
 config BR2_PACKAGE_DOVECOT_SQLITE
 	bool "sqlite support"