[NFC] Enable -Wall for math_brute_force (#1477)
[NFC] Enable -Wall for math_brute_force (#1477)

math_brute_force compiles cleanly with `-Wall` currently, so avoid
regressing from that state.  Ideally we would enable `-Wall` in the
top-level CMakeLists.txt, but other tests do not compile cleanly with
`-Wall` yet.

Signed-off-by: Sven van Haastregt <c87899f97800fb9ac456b806e5f84934b5e9c197@arm.com>

Signed-off-by: Sven van Haastregt <c87899f97800fb9ac456b806e5f84934b5e9c197@arm.com>
KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS