[PATCH, GCC] Require c99_runtime for pr78622.c

[Thomas Preudhomme]

Hi,

Testcase gcc.c-torture/execute/pr78622.c uses %hhd printf specifier
which was introduced in C99. C89 only recognizes h, l and L length
specifier, it does not recognize hh length specifier. As such, this
commit adds a c99_runtime effective target requirement.

ChangeLog entry is as follows:

*** gcc/testsuite/ChangeLog ***

2017-05-04  Thomas Preud'homme  <thomas.preudho...@arm.com>

        * gcc.c-torture/execute/pr78622.c: Require c99_runtime effective
        target.


Committed as obvious.

Best regards,

Thomas