ccache's configure tries to do a runtime test to
determine hw_cv_func_snprintf_c99 and hw_cv_func_vsnprintf_c99
which wont work in OE.
c99 versions of these functions are provided on all
supported libc implementations in OE-Core
(From OE-Core rev: dbf2ac39913429a0d2a8ce129cebe4469d6a2c22)
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>