LatinIME: Fix build with -DNDEBUG and gcc 4.6+ -Werror

Fix variables being defined but not used in the NDEBUG
case, needed to fix the build with gcc 4.6+ -Werror

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Add workaround for SW keyboard not opening in gcc 4.8 based builds

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Signed-off-by: Amit Pundir <amit.pundir@linaro.org>