__NO_STRING_INLINES was removed from uClibc around 2004 so has no
effect.

libstdc++-v3/ChangeLog:

2018-10-01  Bernhard Reutner-Fischer  <aldot@gcc.gnu.org>

        * config/os/uclibc/os_defines.h (__NO_STRING_INLINES): Delete.

From-SVN: r264783