sqlite: bump version

Fixes database corruption with rollback
http://www.sqlite.org/releaselog/3_6_12.html

package/database/sqlite/sqlite.mk

@@ -4,7 +4,7 @@
 #
 #############################################################
 
-SQLITE_VERSION = 3.6.11
+SQLITE_VERSION = 3.6.12
 SQLITE_SOURCE = sqlite-$(SQLITE_VERSION).tar.gz
 SQLITE_SITE = http://www.sqlite.org
 SQLITE_INSTALL_STAGING = YES