Revert "libc: build with -fno-strict-aliasing [TEMP]"

This reverts commit 6806f29355e2335fba8b135a5a86dd7e32f92d1b.
bionic: Fix aliasing violations

This makes bionic compile with compilers enforcing
strict adherence to aliasing rules (e.g. gcc 4.6+
with -Wstrict-aliasing=2 -Werror=strict-aliasing).

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