linux-next 20180320 compile failure - tools/lib/str_error_r.c

[valdis . kletnieks]

Not sure who to blame here, or what changed in gcc between 0.16 and 0.19,
or what the proper fix is here....

next-20180307 with "gcc version 8.0.1 20180222 (Red Hat 8.0.1-0.16)" built and runs fine.

next-20180320 with "gcc (GCC) 8.0.1 20180317 (Red Hat 8.0.1-0.19)"  dies a horrid death early
during the compile:

  CC       /usr/src/linux-next/tools/objtool/str_error_r.o
../lib/str_error_r.c: In function 'str_error_r':
../lib/str_error_r.c:25:3: error: passing argument 1 to restrict-qualified parameter aliases with argument 5 [-Werror=restrict]
   snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, %p, %zd)=%d", errnum, buf, buflen, err);
   ^~~~~~~~
cc1: all warnings being treated as errors
mv: cannot stat '/usr/src/linux-next/tools/objtool/.str_error_r.o.tmp': No such file or directory
make[3]: *** [Build:22: /usr/src/linux-next/tools/objtool/str_error_r.o] Error 1
make[2]: *** [Makefile:46: /usr/src/linux-next/tools/objtool/objtool-in.o] Error 2
make[1]: *** [Makefile:63: objtool] Error 2
make: *** [Makefile:1681: tools/objtool] Error 2

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