[committed] Fix minor testsuite problems on H8 after C99 changes

[committed] Fix minor testsuite problems on H8 after C99 changes

Two minor regressions on the H8 were triggered by the C99 changes.  First
pr58400.c has several functions without prototypes.  I just added -fpermissive
to that test.  Second pr17306-2.c has a single call to an unprototyped function
for which I added the prototype.

These are both H8 specific tests.

gcc/testsuite
	* gcc.target/h8300/pr58400.c: Add -fpermissive.
	* gcc.target/h8300/pr17306-2.c: Add missing prototype.