[Bug c++/61649] fixincludes update for solaris___restrict in sys/feature_tests.h on Illumos

[richard at netbsd dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61649

--- Comment #1 from Richard PALO <richard at netbsd dot org> ---
given https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52168,
it seems necessary to update the test_text line with a newline appended
as follows so that check.sh doesn't balk:
>+    test_text = "#if (defined(__STDC__) && defined(_STDC_C99))\n"
>+              "#define        _RESTRICT_KYWD  restrict";