slang: Use -fno-strict-aliasing where needed

Use -fno-strict-aliasing here so we don't have to use it globally

Change-Id: I4fa11b032163e218606db1ca9ee9c704803f450f
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
Merge branch 'linaro' into HEAD