libxcrypt: Update to 4.4.19 release and fix symbol version issues

This patch upgrades to the 4.4.19 release and replaces a configure patch
from "libxcrypt: fix sporadic failures in nativesdk-libxcrypt-compat" with
a fix to avoid leading spaces in CFLAGS causing failures.

The license changed a few filenames listed in the license but the overall
license remains unchanged.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>