dialog: upgrade to 1.2-20150225

1. upgrade it to 1.2-20150225
2. update the use-pkg-config-for-ncurses-detection.patch
3. remove dialog-static recipe file, since dialog will generate the static
library.

Signed-off-by: Roy Li <rongqing.li@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>