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GCC 8 warns about strncat calls with truncated output. string/bug-strncat1.c tests such a call; this patch disables the warning for it. Tested (compilation) with GCC 8 for x86_64-linux-gnu with build-many-glibcs.py (in conjunction with Martin's patch to allow glibc to build). * string/bug-strncat1.c: Include <libc-diag.h>. (main): Disable -Wstringop-truncation for strncat call for GCC 8. (cherry picked from commit ec72135e5f1d061cb5cf7cd1b855fd6290be10d9)