Revert "dialog: added a patch to fix crashes occuring on user input"

This reverts commit 2aa8a1c51baf50d139a01eeaf7a64420e25009a8.
dialog: Bump to version 1.2-20140219

The previous version did not work well on architectures where the "char"
type is signed by default (e.g. MIPS), due to an incorrect call to
toupper() which was triggering an assertion failure.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>