[committed] Fix gnu23-builtins-no-dfp

[committed] Fix gnu23-builtins-no-dfp

Last patch for the night.  There's still a bit of minor fallout left in GCC
(loongarch testsuite for example).  But things are looking good on the targets
I test.  The plan is to start submitting the various newlib/libgloss fixes
tomorrow.

Anyway, this test was the one I was most concerned about.  Basically we're
testing that on a !dfp target that the builtins are not available.  It expects
a warning, but gets an error by default now.  I just changed the test to use
-fpermissive, so that the test behaves as it did previously.

Pushed to the trunk.

gcc/testsuite
	* gcc.dg/gnu23-builtins-no-dfp-1.c: Add -fpermissive.