dovecot: add missing indirect dependency on !avr32 for mysql

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/dovecot/Config.in

@@ -22,13 +22,15 @@ config BR2_PACKAGE_DOVECOT_BZIP2
 config BR2_PACKAGE_DOVECOT_MYSQL
 	bool "mysql support"
 	select BR2_PACKAGE_MYSQL
-	depends on BR2_INSTALL_LIBSTDCPP
-	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_INSTALL_LIBSTDCPP # mysql
+	depends on BR2_TOOLCHAIN_HAS_THREADS # mysql
+	depends on !BR2_avr32 # mysql
 	help
 	  Enable MySQL support.
 
 comment "mysql support needs a toolchain w/ C++, threads"
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_avr32
 
 config BR2_PACKAGE_DOVECOT_OPENSSL
 	bool "openssl support"