Fix undefined behavior and warning with clang
Fix undefined behavior and warning with clang

This fixes a warning from clang about undefined behavior:

error: embedding a directive within macro arguments has undefined behavior [-Werror,-Wembedded-directive]

dormando/memcached,memcached/memcached,dormando/memcached,memcached/memcached,memcached/memcached,memcached/memcached,memcached/memcached,dormando/memcached,dormando/memcached,dormando/memcached