[SH][committed] Fix excess failures in SH tests caused by switch to GNU11

[Oleg Endo]

Hi,

Attached patch fixes warnings in some of the SH test cases which are
caused by the switch to GNU11.  Committed as r216351.

Cheers,
Oleg

gcc/testsuite/ChangeLog:
	* gcc.target/sh/cmpstr.c: Fix excess failures caused by switch to GNU11.
	* gcc.target/sh/strlen.c: Likewise.
	* gcc.target/sh/pr51244-13.c: Likewise.
	* gcc.target/sh/cmpstrn.c: Likewise.
	* gcc.target/sh/hiconst.c: Likewise.
	* gcc.target/sh/pr43417.c: Likewise.
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