xxhash: backport patch to fix special char problem

xxhash: backport patch to fix special char problem

When building nativesdk-xxhash, we get error like below.

   Makefile:422: *** configured libdir (/opt/poky/3.3+snapshot/sysroots/x86_64-pokysdk-linux/usr/lib) is outside of
   exec_prefix (/opt/poky/3.3+snapshot/sysroots/x86_64-pokysdk-linux/usr), can't generate pkg-config file.  Stop.

This is because we have '+' in the path.

Backport a patch to fix this problem.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>